voidex/20-29 Areas/20 Programming/20.01 Python/variableNamingBestPractices.md

title	tags	aliases
variableNamingBestPractices	python variables syntax naming constants	naming conventions snake_case ALL_CAPS variable reassignment

[!important] Naming Best Practices

• Use snake_case for variables: user_name, email_count

• Use ALL_CAPS for constants: MAX_CONNECTIONS = 10

  • Python doesn't enforce constants, but the convention is SCREAMING_SNAKE_CASE
  • Define constants at the module level for global visibility

• Avoid unintentional reassignment. Python allows variable re-binding to different types:

my_var = 1
my_var = "Now I'm a string"

• Variables don’t auto-update in expressions. You must reassign explicitly:

bacon = bacon + 1
# or
bacon += 1

[!example] Reassignment Example

first_variable = 1
first_variable = 2
print(type(first_variable))  # <class 'int'>
print(first_variable)        # 2

first_variable = "I'm a string now! I used to be an integer."
print(type(first_variable))  # <class 'str'>
print(first_variable)

[!info] Related Notes
variableNamingRules
typeConversions
pythonSyntaxOverview