Cheatography
https://cheatography.com
Cheatsheet PEP8 style guide for python and some important structures.
This is a draft cheat sheet. It is a work in progress and is not finished yet.
Code Lay-out
Identation |
4 spaces |
Max. Length |
79 characters |
Bracket/etc. closing |
my_list = [
1, 2, 3,
4, 5, 6,
] |
Break before binary operator |
x = a + b
+ c |
Imports |
import _ as _
from _ import _, _ |
String Quotes (both correct) |
a = "word"
b = 'word' |
Whitespace
Bracket/etc. sides |
spam(ham[1], {eggs: 2}) |
Around an assignment |
x = 4 * y
variable = 4 |
Between a trailing comma
and close parenthesis |
foo = (4,) |
Comma/etc. sides |
if x == 4: print(x, y); x, y = y, x |
Colon sides |
arr[3:6], arr[3:6:]
arr[::9] |
Operators surround
(try in lowest priority) |
x *= 2 + 1
y = (2+5) * (5-1) |
Keyword argument
or default value |
def func(val, age=18):
return num(r=real, i=imag) |
Argument annotation
with a default value |
def func(sep: AnyStr = None, age=10): ... |
Comments
First word
capitalized |
# This is a comment |
Block |
# This is a
# block. Yes.
#
# It is. |
Inline |
y = x + 1 # Linear |
Docstrings |
def calc_age():
¨¨¨Return the age
Be careful with the end
¨¨¨ |
|
|
Naming Conventions
Variable/Function |
lower_case_with_underscores |
Class/Exception |
CapWords |
Non-public methods and instance variables |
_var |
Constants |
UPPER_CASE_WITH_UNDERSCORES |
Dunders |
__var__ |
Structures
Conditional |
if x == 0:
...
elif x == 1:
...
else:
... |
Ternary |
y = 0 if x == 0 else x == 1 |
Match |
match x:
case 0:
...
case 1:
...
case_:
... |
For in |
for i in list:
... |
While |
while x >= 0:
...
x -= 1 |
Function |
def calc_age(day, month, year=2004):
... |
List comprehension |
[x**2 for x in list if x != 0] |
Map |
map(lambda x: x**2, list) |
Filter |
filter(lambda x: x < 0, list) |
Reduce |
reduce((lambda x, y: x * y), list) |
|
