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Python Cheat Sheet

Dave Child (DaveChild)

via

cheatography.com/1/cs/19/

Python sys Variables

argv

builtin_module_names

byteorder

check_interval

exec_prefix

executable

exitfunc

modules

path

platform

stdin, stdout, stderr

version_info

winver

Python sys.argv

sys.argv[0]

sys.argv[1]

sys.argv[2]

sys.argv[3]

sys.argv[4]

sys.argv for the command:

$ python foo.py bar -c qux --h

Python os Variables

altsep

curdir

defpath

devnull

extsep

linesep

name

pardir

pathsep

sep

Alternative sep

Current dir string

Default search path

Path of null device

Extension separator

Line separator

Name of OS

Parent dir string

Patch separator

Path separator

foo.py

bar

-c

qux

--h

Python String Methods

capitalize() *

center(width)

count(sub, start, end)

decode()

encode()

endswith(sub)

expandtabs()

find(sub, start, end)

index(sub, start, end)

isalnum() *

isalpha() *

isdigit() *

islower() *

isspace() *

lstrip()

partition(sep)

replace(old, new)

rfind(sub, start ,end)

rindex(sub, start, end)

rjust(width)

rpartition(sep)

rsplit(sep)

rstrip()

split(sep)

splitlines()

startswith(sub)

strip()

swapcase() *

Command line args

Linked C modules

Native byte order

Signal check

frequency

Root directory

Name of executable

Exit function name

Loaded modules

Search path

Current platform

File objects for I/O

Python version info

Version number

Python List Methods

append(item)

count(item)

extend(list)

index(item)

insert(position, item)

pop(position)

remove(item)

reverse()

sort()

Python Class Special Methods

__new__(cls)

__init__(self, args)

__del__(self)

__repr__(self)

__str__(self)

__cmp__(self, other)

__index__(self)

__hash__(self)

__getattr__(self, name)

__getattribute__(self, name)

__setattr__(self, name, attr)

__delattr__(self, name)

__call__(self, args, kwargs)

__lt__(self, other)

__le__(self, other)

__gt__(self, other)

__ge__(self, other)

__eq__(self, other)

__ne__(self, other)

__nonzero__(self)

Python String Methods (cont)

istitle() *

isupper() *

join()

ljust(width)

lower() *

Methods marked * are locale dependant for 8-

bit strings.

Python File Methods

close()

flush()

fileno()

isatty()

next()

read(size)

readline(size)

Python Indexes and Slices

len(a)

a[0]

a[5]

a[-1]

a[-2]

a[1:]

a[:5]

a[:-2]

a[1:3]

a[1:-1]

b=a[:]

[1,2,3,4,5]

[0,1,2,3,4]

[0,1,2,3]

[1,2]

[1,2,3,4]

Shallow copy of a

readlines(size)

seek(offset)

tell()

truncate(size)

write(string)

writelines(list)

title() *

translate(table)

upper() *

zfill(width)

Indexes and Slices of a=[0,1,2,3,4,5]

Python Datetime Methods

today()

now(timezoneinfo)

utcnow()

fromordinal(ordinal)

combine(date, time)

strptime(date, format)

Registered OS names: "posix", "nt",

"mac", "os2", "ce", "java", "riscos"

fromtimestamp(timestamp)

utcfromtimestamp(timestamp)

Dave Child

(DaveChild)

cheatography.com/davechild/

www.getpostcookie.com

Published 19th October, 2011.

Last updated 12th May, 2016.

Page 1 of 2.

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Python Cheat Sheet

Dave Child (DaveChild)

via

cheatography.com/1/cs/19/

Python Time Methods

replace()

isoformat()

__str__()

strftime(format)

Python Date Formatting

Abbreviated weekday (Sun)

Weekday (Sunday)

Abbreviated month name (Jan)

Month name (January)

Date and time

Day (leading zeros) (01 to 31)

24 hour (leading zeros) (00 to 23)

12 hour (leading zeros) (01 to 12)

Day of year (001 to 366)

Month (01 to 12)

Minute (00 to 59)

AM or PM

Second (00 to 61⁴)

Week number¹ (00 to 53)

Weekday² (0 to 6)

Week number³ (00 to 53)

Date

Time

Year without century (00 to 99)

Year (2008)

Time zone (GMT)

A literal "%" character (%)

utcoffset()

dst()

tzname()

¹ Sunday as start of week. All days in a new year preceding the

first Sunday are considered to be in week 0.

² 0 is Sunday, 6 is Saturday.

³ Monday as start of week. All days in a new year preceding the

first Monday are considered to be in week 0.

⁴

This is not a mistake. Range takes account of leap and double-

leap seconds.

Dave Child

(DaveChild)

cheatography.com/davechild/

www.getpostcookie.com

Published 19th October, 2011.

Last updated 12th May, 2016.

Page 2 of 2.

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