Revision of Why PIP?

kristofer 修订了这个 Gist 1731508154. 跳至此修订

1 file changed, 1 insertion

why-pip.md

			@@ -119,3 +119,4 @@ Data retrieved successfully:
119	119
120	120		And you still need to to understand how to use [Python Virtual Environments](https://zcw.guru/kristofer/python3-venvs).
121	121
	122	+	_And another thing, what the hell is [PyPi](https://pypi.org)??_

kristofer 修订了这个 Gist 1731507205. 跳至此修订

1 file changed, 2 insertions, 1 deletion

why-pip.md

			@@ -113,7 +113,8 @@ And now when we run `fetchjson.py`
113	113		```bash
114	114		(venv) foo@bar ~ % python3 fetchjson.py
115	115		Data retrieved successfully:
116		-	{'userId': 1, 'id': 1, 'title': 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit', 'body': 'quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto'}
	116	+	{'userId': 1, 'id': 1, 'title': 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit',
	117	+	'body': 'quia et suscipit\nsuscipit recusandae consequuntur reprehenderit sunt rem eveniet architecto'}
117	118		```
118	119
119	120		And you still need to to understand how to use [Python Virtual Environments](https://zcw.guru/kristofer/python3-venvs).

kristofer 修订了这个 Gist 1731507150. 跳至此修订

1 file changed, 3 insertions, 4 deletions

why-pip.md

			@@ -80,12 +80,11 @@ Our `python` environment doesn't have a copy of `requests` and can't find the co
80	80
81	81		_What is `requests` anyway? Well, check out [requests 2.32.3](https://pypi.org/project/requests/)_
82	82
83		-	So need to get a copy of this package.
84		-
	83	+	So we need to get a copy of this package.
85	84		In a terminal, we can `pip install requests` and we see...
86	85
87	86		```bash
88		-	(venv) kristofer@Atlantan ~ % pip install requests
	87	+	(venv) foo@bar ~ % pip install requests
89	88		Collecting requests
90	89		Downloading requests-2.32.3-py3-none-any.whl.metadata (4.6 kB)
91	90		Collecting charset-normalizer<4,>=2 (from requests)
			@@ -112,7 +111,7 @@ And now when we run `fetchjson.py`
112	111
113	112
114	113		```bash
115		-	(venv) kristofer@Atlantan ~ % python3 fetchjson.py
	114	+	(venv) foo@bar ~ % python3 fetchjson.py
116	115		Data retrieved successfully:
117	116		{'userId': 1, 'id': 1, 'title': 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit', 'body': 'quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto'}
118	117		```

kristofer 修订了这个 Gist 1731506543. 跳至此修订

1 file changed, 1 insertion, 1 deletion

why-pip.md

			@@ -117,5 +117,5 @@ Data retrieved successfully:
117	117		{'userId': 1, 'id': 1, 'title': 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit', 'body': 'quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto'}
118	118		```
119	119
120		-	And you still need to to understand how to use Python Virtual Environments.
	120	+	And you still need to to understand how to use [Python Virtual Environments](https://zcw.guru/kristofer/python3-venvs).
121	121

kristofer 修订了这个 Gist 1731506467. 跳至此修订

1 file changed, 64 insertions

why-pip.md

			@@ -54,4 +54,68 @@ if __name__ == "__main__":
54	54
55	55		but when you run this code...
56	56
	57	+	```bash
	58	+	Traceback (most recent call last):
	59	+	File "<python-input-0>", line 1, in <module>
	60	+	import requests
	61	+	ModuleNotFoundError: No module named 'requests'
	62	+	Traceback (most recent call last):
	63	+	File "<python-input-0>", line 14, in <module>
	64	+	get_data()
	65	+	~~~~~~~~^^
	66	+	File "<python-input-0>", line 5, in get_data
	67	+	response = requests.get(url)
	68	+	^^^^^^^^
	69	+	NameError: name 'requests' is not defined
	70	+	```
	71	+
	72	+	Hmm.
	73	+
	74	+	### PIP to the rescue.
	75	+
	76	+	Notice the `import requests` line at the top of the code sample.
	77	+
	78	+	That's the error.
	79	+	Our `python` environment doesn't have a copy of `requests` and can't find the code.
	80	+
	81	+	_What is `requests` anyway? Well, check out [requests 2.32.3](https://pypi.org/project/requests/)_
	82	+
	83	+	So need to get a copy of this package.
	84	+
	85	+	In a terminal, we can `pip install requests` and we see...
	86	+
	87	+	```bash
	88	+	(venv) kristofer@Atlantan ~ % pip install requests
	89	+	Collecting requests
	90	+	Downloading requests-2.32.3-py3-none-any.whl.metadata (4.6 kB)
	91	+	Collecting charset-normalizer<4,>=2 (from requests)
	92	+	Downloading charset_normalizer-3.4.0-cp313-cp313-macosx_11_0_arm64.whl.metadata (34 kB)
	93	+	Collecting idna<4,>=2.5 (from requests)
	94	+	Downloading idna-3.10-py3-none-any.whl.metadata (10 kB)
	95	+	Collecting urllib3<3,>=1.21.1 (from requests)
	96	+	Downloading urllib3-2.2.3-py3-none-any.whl.metadata (6.5 kB)
	97	+	Collecting certifi>=2017.4.17 (from requests)
	98	+	Downloading certifi-2024.8.30-py3-none-any.whl.metadata (2.2 kB)
	99	+	Downloading requests-2.32.3-py3-none-any.whl (64 kB)
	100	+	Downloading certifi-2024.8.30-py3-none-any.whl (167 kB)
	101	+	Downloading charset_normalizer-3.4.0-cp313-cp313-macosx_11_0_arm64.whl (119 kB)
	102	+	Downloading idna-3.10-py3-none-any.whl (70 kB)
	103	+	Downloading urllib3-2.2.3-py3-none-any.whl (126 kB)
	104	+	Installing collected packages: urllib3, idna, charset-normalizer, certifi, requests
	105	+	Successfully installed certifi-2024.8.30 charset-normalizer-3.4.0 idna-3.10 requests-2.32.3 urllib3-2.2.3
	106	+
	107	+	[notice] A new release of pip is available: 24.2 -> 24.3.1
	108	+	[notice] To update, run: pip install --upgrade pip
	109	+	```
	110	+
	111	+	And now when we run `fetchjson.py`
	112	+
	113	+
	114	+	```bash
	115	+	(venv) kristofer@Atlantan ~ % python3 fetchjson.py
	116	+	Data retrieved successfully:
	117	+	{'userId': 1, 'id': 1, 'title': 'sunt aut facere repellat provident occaecati excepturi optio reprehenderit', 'body': 'quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto'}
	118	+	```
	119	+
	120	+	And you still need to to understand how to use Python Virtual Environments.
57	121

kristofer 修订了这个 Gist 1731506046. 跳至此修订

1 file changed, 37 insertions

why-pip.md

			@@ -1,3 +1,39 @@
	1	+	## Why PIP?
	2	+
	3	+	"pip install" is crucial in the Python ecosystem for several reasons:
	4	+
	5	+
	6	+	Imagine you're building a web application: You might need various libraries to
	7	+	handle web frameworks, database connections, or even data visualization.
	8	+	While Python comes with a rich standard library, many powerful tools and packages are not included by default.
	9	+	Here's where "pip install" comes into play.
	10	+
	11	+	### Example:
	12	+
	13	+	Suppose you want to build a web application using Flask, a popular web framework for Python.
	14	+	Flask isn't included in the Python standard library. To get Flask, you use "pip install":
	15	+
	16	+	```bash
	17	+	pip install Flask
	18	+	```
	19	+
	20	+	Without "pip install," you would have to manually download Flask and manage its dependencies,
	21	+	which can be cumbersome and error-prone. "pip install" automates this process, ensuring you
	22	+	get the correct version of Flask and all its dependencies, making your development process
	23	+	smoother and more efficient.
	24	+
	25	+
	26	+	In essence, "pip install" allows you to easily extend Python's capabilities by accessing a
	27	+	vast repository of third-party packages (at PyPy), facilitating quicker development and
	28	+	ensuring that you can leverage the best tools available.
	29	+
	30	+	## So in Real Life?
	31	+
	32	+	Here's a simple example of a Python program using the requests package to fetch data from a web API.
	33	+	This program will make a GET request to a sample API and print the response:
	34	+
	35	+
	36	+	Say `fetchjson.py`
1	37
2	38		```python
3	39		import requests
			@@ -16,5 +52,6 @@ if __name__ == "__main__":
16	52		get_data()
17	53		```
18	54
	55	+	but when you run this code...
19	56
20	57

kristofer 修订了这个 Gist 1731505856. 跳至此修订

1 file changed, 20 insertions

why-pip.md(file created)

		@@ -0,0 +1,20 @@
1	+
2	+	```python
3	+	import requests
4	+
5	+	def get_data():
6	+	url = "https://jsonplaceholder.typicode.com/posts/1"
7	+	response = requests.get(url)
8	+
9	+	if response.status_code == 200:
10	+	print("Data retrieved successfully:")
11	+	print(response.json())
12	+	else:
13	+	print("Failed to retrieve data. Status code:", response.status_code)
14	+
15	+	if __name__ == "__main__":
16	+	get_data()
17	+	```
18	+
19	+
20	+

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