Explore variable naming in Python solutions

variable_naming_solutions.py

# Solutions

sumTotal = 42 # Valid

# sum-total = 42 # Invalid. Dashes are a no-no.
sum_total = 42

# sum total = 42 # Invalid. Spaces are a no-no. White space is often meaningful in Python.
sum_total = 42

sum_total = 42 # This is valid. The best example because it follows pep8 style guidelines. 

# sum = 42 # Valid but a terrible idea. Never name a variable or function with the same name as a built-in.
total = 42 # Better alternative. This is my preference for naming - clarity is primary and beverity is secondary.

# 2x = 42 # Invalid
x2 = 42

# -4 = 42 # Invalid
neg_4 = 42

# if = 42 # Invalid. Reserved keyword.
if_variable = 42

# while = 42 # Invalid. Reserved keyword.
while_variable = 42

Private = 42 # Valid

public = 42 # Valid

_static = 42 # Valid. Creates a "hidden" variable.

_4 = 42      # Valid. Creates a "hidden" variable.
 
_ = 42       # Valid. Creates a "hidden" variable. This is common for throw-a-away variables - for i, _ in enumerate(["one", "two", "three"]): print(i)

___ = 42     # Valid. More of the same "hidden" variable hack in Python.

# $16 = 42 # Invalid
dollars_16 = 42

U$O = 42 # Invalid
USO = 42

# 10% = 42 # Invalid
ten_percent = 42

maçã_da_beira_alta = "🍎" # Valid. Python tries to be inclusive and support as many human languages as possible.

ಠ_ಠ = "hmmm…" # Valid. Source - https://twitter.com/jakevdp/status/1239979963920445441

λ = 42  # Valid. It is a letter in an alphabet. In this case, the Greek alphabet.

# 🐶 = 42 # Invalid. Emojis are not letters in an alphabet.
puppy = 42

# The criterion and a complete list of valid characters to start a variable with
# https://stackoverflow.com/questions/17043894/what-unicode-symbols-are-accepted-in-python3-variable-names