feat(projects): 新增Click综合案例示例代码及素材

projects/click-cli/basic/fake_pip.py

@@ -0,0 +1,45 @@
+def fetch(target):
+    print(f"fetch {target}...")
+
+
+def is_url(src):
+    if not (src.startswith("http") and src.startswith("https")):
+        return False
+    return True
+
+
+def download(url_or_package):
+    if not is_url(url_or_package):
+        fetch(url_or_package)
+        return
+
+
+def _install(package=None, requirements=None):
+    if not package and requirements:
+        for _package in requirements:
+            download(_package)
+    elif package and not requirements:
+        download(package)
+    else:
+        raise ValueError(
+            "`package` parameter is required "
+            "if there isn't `requirements` parameter."
+        )
+
+
+class PipCommand:
+    def __init__(self) -> None:
+        pass
+
+    def install(self, *args, **kwargs):
+        _install(*args, **kwargs)
+
+
+if __name__ == '__main__':
+    pip = PipCommand()
+    package = "pandas"
+    requirements = ["pandas", "numpy"]
+
+    # usage
+    pip.install(package=package)
+    pip.install(requirements=requirements)