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authorsrdusr <[email protected]>2023-07-23 13:50:43 +0200
committersrdusr <[email protected]>2023-07-23 13:50:43 +0200
commit645576e0d5d1f692de015fe7bdd385abe49a0cda (patch)
treefd667211cb2dedc65acf6208e4d826704fdfd08f /languages
parentfde8e9d43262362df6a917751f72b50300a2f4d1 (diff)
parent2de94da70e28973bab7f23af8868b8efe2813f0c (diff)
downloadnotes-645576e0d5d1f692de015fe7bdd385abe49a0cda.tar.gz
notes-645576e0d5d1f692de015fe7bdd385abe49a0cda.zip
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-Python Documentation: https://docs.python.org
-curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
-python get-pip.py
-
-use this in nvim :help python
-
-pip --version
-Planning to develop some python application or python package your best option is use virtual environments.
-Try virtualenv or even conda
-
-Use poetry much better option to manage application from start to finish. It is a much better option than requirements.txt + setup.py.
-
-
-Another more simple option is use python-virtualenv. This can bring portability to the code and maintain old packages as well. Install it with
-
-sudo pacman -S python-virtualenv
-
-and then do this
-
-virtualenv -p /usr/bin/python3 yourenv
-source yourenv/bin/activate
-pip install package-name
-
-When you create this environment yourenv, you will setup pip to install packages only into this environment, not to the entire system.
-Basic Syntax
-Comments
-
-python
-
-# This is a single-line comment
-
-"""
-This is a
-multi-line comment
-"""
-
-Variables
-
-python
-
-# Declaration and initialization
-x = 10
-
-# Declaration without initialization
-y = None
-
-Data Types
-Data Type Description
-int Integer Represents whole numbers without a fractional component
-float Float Represents real numbers with a single-precision format
-str String Represents a sequence of characters
-bool Boolean Represents a logical value, either True or False
-list List Represents an ordered, mutable collection of elements
-tuple Tuple Represents an ordered, immutable collection of elements
-dict Dictionary Represents a collection of key-value pairs
-set Set Represents an unordered collection of unique elements
-Arithmetic Operators
-
- Addition: x + y
- Subtraction: x - y
- Multiplication: x * y
- Division: x / y
- Modulus: x % y
- Exponentiation: x ** y
- Floor Division: x // y
-
-String Operations
-
-python
-
-string = "Hello, World!"
-
-len(string) # Length of string
-string.upper() # Convert to uppercase
-string.lower() # Convert to lowercase
-string.strip() # Remove whitespace
-string.split(",") # Split by comma
-
-Control Flow
-
- Conditional Statements
-
-python
-
-if condition:
- # Code to execute if condition is true
-elif another_condition:
- # Code to execute if another_condition is true
-else:
- # Code to execute if neither condition is true
-
- Loops
-
-python
-
-for item in iterable:
- # Code to execute for each item in iterable
-
-while condition:
- # Code to execute while condition is true
-
-Functions
-
-python
-
-def function_name(parameter1, parameter2):
- # Code to execute
- return result # Optional return statement
-
-Data Structures
-
- Lists
-
-python
-
-my_list = [1, 2, 3, 4, 5]
-
-my_list.append(6) # Add item to the end of the list
-my_list.insert(0, 0) # Insert item at a specific index
-my_list.remove(3) # Remove item from the list
-my_list.pop() # Remove and return the last item
-my_list.sort() # Sort the list
-
- Dictionaries
-
-python
-
-my_dict = {"key1": "value1", "key2": "value2"}
-
-my_dict["key3"] = "value3" # Add a new key-value pair
-del my_dict["key2"] # Delete a key-value pair
-my_dict.keys() # Get all keys
-my_dict.values() # Get all values
-my_dict.items() # Get all key-value pairs
-
- Sets
-
-python
-
-my_set = {1, 2, 3}
-
-my_set.add(4) # Add an element to the set
-my_set.remove(3) # Remove an element from the set
-
- Python is case-sensitive (e.g., variable and Variable are different).
- Python uses indentation (usually four spaces) to define code blocks. Indentation is important for the structure and readability of your code.
- Statements are terminated with a newline. However, you can use a backslash (\) to continue a statement to the next line.
- Python follows the "PEP 8" style guide, which suggests guidelines for writing Python code. Some key points include:
- Use descriptive variable and function names.
- Use lowercase letters with words separated by underscores for variable and function names (e.g., my_variable, my_function).
- Use uppercase letters with words separated by underscores for constants (e.g., MY_CONSTANT).
- Use spaces around operators and after commas (e.g., x = 5 + 2, my_function(arg1, arg2)).
- Limit line length to 79 characters.
- Python supports both single-quoted (') and double-quoted (") strings. Use whichever is more appropriate for your case, but be consistent.
- Python uses zero-based indexing for lists, tuples, and strings. The first element is accessed with index 0.
- Python allows for multiple assignment in a single line, e.g., x, y = 10, 20.
- Python has no mandatory declaration of variables. Variables are created when a value is assigned to them.
- Python uses the None value to represent the absence of a value or a null value.
- Python has a dynamic type system, meaning you can reassign variables to different types.
- Python is an interpreted language, which means it is not compiled but executed line by line.
- Use meaningful comments to explain the purpose and functionality of your code.
- Python uses the # symbol to denote single-line comments.
- Use docstrings (multi-line comments enclosed in triple quotes) to provide documentation for functions, classes, and modules.
- Use the backslash (\) to continue a statement onto the next line when necessary.
- Use parentheses to group expressions and clarify the order of operations.
- Avoid using single-character variable names, except in cases where the purpose is clear (e.g., loop counters).
- Follow the DRY (Don't Repeat Yourself) principle and avoid duplicating code. Instead, use functions or loops to encapsulate and reuse code.
- Use meaningful names for variables, functions, and classes that reflect their purpose and intent.
- Use snake_case naming convention for functions, variables, and modules (e.g., my_function, my_variable, my_module.py).
- Use CamelCase naming convention for classes (e.g., MyClass).
- Use appropriate spacing around operators and after commas to enhance readability.
- Follow proper code formatting by using consistent indentation and line breaks.
- Avoid unnecessary or excessive code comments that only restate the code itself.
- Make use of white space to improve code readability, such as adding blank lines between functions or sections of code.
- Use built-in functions and libraries whenever possible to leverage existing functionality and improve code efficiency.
- Use a consistent naming convention for constants, such as using uppercase letters with underscores (e.g., MAX_VALUE).
- Avoid using global variables whenever possible, as they can lead to code complexity and make debugging difficult.
-curl -OJL https://docs.python.org/3/archives/python-3.9.7-docs-html.tar.bz2
-
-tar -xvf python-3.9.7-docs-html.tar.bz2
-After extraction, you can navigate to the extracted directory and open the index.html file in a web browser to access the offline Python documentation.
-or to generate the documentation for a specific Python module or package, use the following command:
-
-pydoc -w module_name
-
-Replace module_name with the name of the module or package for which you want to generate documentation. For example, to generate documentation for the os module, you can use:
-
-
-pydoc -w os
-
-Additionally, you can use the -p option with pydoc to launch a local web server and view the documentation in your web browser. For example:
-
-
-pydoc -p 5000
-This command will start a web server on port 5000, and you can access the documentation by opening your browser and navigating to http://localhost:5000.