Using The Python Command Line Interface
The python interpreter shell can be invoked by typing “python” on the terminal on Linux, Mac OS and other POSIX systems. For windows systems, the postfix “.exe” is needed.
It is easy to execute python scripts on the command line or run python code in the shell.
The python command has several flags for different options.
Python Command
Flags
| Name | Flag | Example |
|---|---|---|
| Help | -? | python -? |
| Help | -h | python -h |
| Help | –help | python –help |
| Version | -V | python -V |
| Version | –version | python –version |
| Run code | -c | python -c “print(‘Hello World’)” |
| Run module | -m | python -m mymodule |
| Python CLI | Recommend if installed | 2024 |
# Strings
str1 = "Hello World" # Double Quotes
str2 = 'Hello World!' # Single Quotes
print (str1, str2) # Output Multiple Variables
# Quotes Inside Strings
str1 = "It’s easy" # Double Quotes With Single Quote
str2 = "Call me 'Johnny'" # Double Quotes With Single Quotes
str3 = 'Call me "Johnny"' # Single Quotes With Double Quotes
print(str1, str2, str3) # Output Multiple Variables
# Multiline Strings
str1 = """This is a double quoted
multiple line string
spanning 3 rows."""
print(str1) # Output
# Slicing Strings
str1 = "Hello, World!" # Double Quotes
print (str1[2:5]) # Prints from position 2 to position 5
# Concatenate Strings
str1 = "Hello"
str2 = "World"
str3 = str1 + " " + str2
print(str3) # Displays Hello World
# F-Strings Format Strings
age = 24
name = "John"
combined = f"My name is {name}, and I am {age} years old"
print(combined)
# Escape Characters
str1 = "My name is \"Johnny\" but you can call me \"John\"."
print(str1)
Usage
You can use the interactive shell after installing Python. The initial screen displays the version and help information. You can use various flags on the command line interface to execute Python code.
Open Source
Python is licensed under the Python Software Foundation License. This allows commercial use, modification, distribution, and allows making derivatives proprietary. Since it is made with Python, it makes it easier to contribute and modify.
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Conclusion:
Install the Python by compiling from source or downloading binaries for your device. Use Python command line interface to create custom scripts or code.
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- Python Command line and environment