feat: 新增Vol06章节示例源码
This commit is contained in:
100gle
384
code/06/strings.ipynb
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384
code/06/strings.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 不可变的字符串与「可变的」字符串"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"True\n"
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]
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}
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],
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"source": [
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"from collections.abc import Sequence\n",
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"\n",
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"s = \"abc\"\n",
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"print(isinstance(s, Sequence))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"a\n",
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"ab\n"
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]
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}
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],
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"source": [
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"print(s[0])\n",
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"print(s[:-1])"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"# can't mute string.\n",
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"# s = \"abc\"\n",
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"# s[0] = \"b\""
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"s1: abc, address: 140669038667824\n",
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"s2: abc, address: 140669042995440\n"
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]
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}
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],
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"source": [
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"s1 = \"abc\"\n",
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"s2 = s1.lower()\n",
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"print(f\"s1: {s1}, address: {id(s1)}\")\n",
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"print(f\"s2: {s2}, address: {id(s2)}\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"The Zen of Python\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"\n"
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]
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}
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],
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"source": [
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"poetry = \"\"\"The Zen of Python\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"\"\"\"\n",
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"print(poetry)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 字符串格式化"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 使用 % 号占位符"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hello, 100gle! Today is 2022-05-12, temperature is 17 ℃\n"
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]
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}
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],
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"source": [
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"# % placeholder\n",
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"from datetime import datetime\n",
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"\n",
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"name = \"100gle\"\n",
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"now = datetime.now().date()\n",
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"temperature = 17\n",
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"\n",
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"s = \"Hello, %s! Today is %s, temperature is %d ℃\" % (name, now, temperature)\n",
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"print(s)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## format 方法"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hello, 100gle! Today is 2022-05-12, temperature is 17 ℃\n",
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"Hello, 100gle! Today is 2022-05-12, temperature is 17 ℃\n",
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"Hello, 100gle! Today is 2022-05-12, temperature is 17 ℃\n"
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]
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}
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],
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"source": [
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"# {} placeholder with format method\n",
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"\n",
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"from datetime import datetime\n",
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"\n",
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"name = \"100gle\"\n",
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"now = datetime.now().date()\n",
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"temperature = 17\n",
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"\n",
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"print(\"Hello, {}! Today is {}, temperature is {} ℃\".format(name, now, temperature))\n",
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"print(\"Hello, {1}! Today is {0}, temperature is {2} ℃\".format(now, name, temperature))\n",
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"print(\"Hello, {name}! Today is {now}, temperature is {temperature} ℃\".format(\n",
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" name=name, now=now, temperature=temperature)\n",
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")\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## f-string"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Hello, 100gle! Today is 2022-05-12, temperature is 17 ℃\n"
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]
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}
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],
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"source": [
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"# f-string\n",
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"from datetime import datetime\n",
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"\n",
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"\n",
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"print(f\"Hello, {'100gle'}! Today is {datetime.now().date()}, temperature is {17} ℃\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"keep five digits: 3.14159\n",
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"with comma: 1,000,000.00\n",
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"indent left: 100gle \n",
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"indent right: 100gle\n",
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"indent center: 100gle \n"
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]
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}
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],
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"source": [
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"from math import pi\n",
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"\n",
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"print(f\"keep five digits: {pi:.5f}\")\n",
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"print(f\"with comma: {1000000:,.2f}\")\n",
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"print(f\"indent left: {'100gle':<10}\")\n",
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"print(f\"indent right: {'100gle':>10}\")\n",
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"print(f\"indent center: {'100gle':^10}\")"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# 常用的字符串方法"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 字符串大小写控制"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"str.capitalize: Hello, world\n",
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"str.title: Hello, World\n",
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"str.upper: HELLO, WORLD\n",
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"str.lower: hello, world\n"
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]
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}
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],
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"source": [
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"s = \"hello, world\"\n",
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"print(f\"str.capitalize: {s.capitalize()}\")\n",
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"print(f\"str.title: {s.title()}\")\n",
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"print(f\"str.upper: {s.upper()}\")\n",
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"print(f\"str.lower: {s.lower()}\")"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 字符串前缀与后缀"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"001-西游记-小说 is start with 002? False\n",
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"001-西游记-小说 is end with 小说? True\n",
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"001-三国演义-小说 is start with 002? False\n",
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"001-三国演义-小说 is end with 小说? True\n",
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"002-乔布斯传-传记 is start with 002? True\n",
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"002-乔布斯传-传记 is end with 小说? False\n",
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"003-论语-古籍 is start with 002? False\n",
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"003-论语-古籍 is end with 小说? False\n",
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"014-品三国-历史 is start with 002? False\n",
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"014-品三国-历史 is end with 小说? False\n"
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]
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}
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],
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"source": [
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"bookshelf = [\n",
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" \"001-西游记-小说\",\n",
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" \"001-三国演义-小说\",\n",
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" \"002-乔布斯传-传记\",\n",
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" \"003-论语-古籍\",\n",
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" \"014-品三国-历史\",\n",
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"]\n",
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"\n",
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"for book in bookshelf:\n",
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" print(f\"{book:<15} is start with 002?\", book.startswith(\"002\"))\n",
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" print(f\"{book:<15} is end with 小说?\", book.endswith(\"小说\"))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## 处理字符串\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 12,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"str.replace: Stay hungry, stay wise \n",
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"str.split: [' Stay hungry', 'stay foolish ']\n",
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"str.strip: Stay hungry, stay foolish\n",
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"str.join: Stay, hungry, stay, foolish\n"
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]
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}
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],
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"source": [
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"s = \" Stay hungry, stay foolish \"\n",
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"\n",
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"print(f\"str.replace: {s.replace('foolish', 'wise')}\")\n",
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"print(f\"str.split: {s.split(', ')}\")\n",
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"print(f\"str.strip: {s.strip()}\")\n",
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"print(f\"str.join: {', '.join(['Stay', 'hungry', 'stay', 'foolish'])}\")"
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]
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}
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],
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"metadata": {
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"interpreter": {
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"hash": "13977d4cc82dee5f9d9535ceb495bd0ab12a43c33c664e5f0d53c24cf634b67f"
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},
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"kernelspec": {
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"display_name": "Python 3.9.0 ('pandas-startup')",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.9.0"
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},
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"orig_nbformat": 4
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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