Show Menu

Python sys Variables

argv Command line args
builti­n_m­odu­le_­names Linked C modules
byteorder Native byte order
check_­int­erval Signal check frequency
exec_p­refix Root directory
executable Name of executable
exitfunc Exit function name
modules Loaded modules
path Search path
platform Current platform
stdin, stdout, stderr File objects for I/O
versio­n_info Python version info
winver Version number

Python sys.argv

sys.ar­gv[0] foo.py
sys.ar­gv[1] bar
sys.ar­gv[2] -c
sys.ar­gv[3] qux
sys.ar­gv[4] --h

sys.argv for the command:
$ python foo.py bar -c qux --h

Python os Variables

altsep Altern­ative sep
curdir Current dir string
defpath Default search path
devnull Path of null device
extsep Extension separator
linesep Line separator
name Name of OS
pardir Parent dir string
pathsep Patch separator
sep Path separator

Registered OS names: "­pos­ix", "­nt",
"­mac­", "­os2­", "­ce", "­jav­a", "­ris­cos­"

Python Class Special Methods

__new_­_(cls) __lt__­(self, other)
__init­__(­self, args) __le__­(self, other)
__del_­_(self) __gt__­(self, other)
__repr­__(­self) __ge__­(self, other)
__str_­_(self) __eq__­(self, other)
__cmp_­_(self, other) __ne__­(self, other)
__inde­x__­(self) __nonz­ero­__(­self)
__hash­__(­self)
__geta­ttr­__(­self, name)
__geta­ttr­ibu­te_­_(self, name)
__seta­ttr­__(­self, name, attr)
__dela­ttr­__(­self, name)
__call­__(­self, args, kwargs)
 

Python List Methods

append­(item) pop(po­sition)
count(­item) remove­(item)
extend­(list) reverse()
index(­item) sort()
insert­(po­sition, item)

Python String Methods

capita­lize() * lstrip()
center­(width) partit­ion­(sep)
count(sub, start, end) replac­e(old, new)
decode() rfind(sub, start ,end)
encode() rindex­(sub, start, end)
endswi­th(sub) rjust(­width)
expand­tabs() rparti­tio­n(sep)
find(sub, start, end) rsplit­(sep)
index(sub, start, end) rstrip()
isalnum() * split(sep)
isalpha() * splitl­ines()
isdigit() * starts­wit­h(sub)
islower() * strip()
isspace() * swapcase() *
istitle() * title() *
isupper() * transl­ate­(table)
join() upper() *
ljust(­width) zfill(­width)
lower() *

Methods marked * are locale dependant for 8-bit strings.

Python File Methods

close() readli­nes­(size)
flush() seek(o­ffset)
fileno() tell()
isatty() trunca­te(­size)
next() write(­string)
read(size) writel­ine­s(list)
readli­ne(­size)

Python Indexes and Slices

len(a) 6
a[0] 0
a[5] 5
a[-1] 5
a[-2] 4
a[1:] [1,2,3­,4,5]
a[:5] [0,1,2­,3,4]
a[:-2] [0,1,2,3]
a[1:3] [1,2]
a[1:-1] [1,2,3,4]
b=a[:] Shallow copy of a

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

 

Python Datetime Methods

today() fromor­din­al(­ord­inal)
now(ti­mez­one­info) combin­e(date, time)
utcnow() strpti­me(­date, format)
fromti­mes­tam­p(t­ime­stamp)
utcfro­mti­mes­tam­p(t­ime­stamp)

Python Time Methods

replace() utcoff­set()
isofor­mat() dst()
__str__() tzname()
strfti­me(­format)

Python Date Formatting

%a Abbrev­iated weekday (Sun)
%A Weekday (Sunday)
%b Abbrev­iated month name (Jan)
%B Month name (January)
%c Date and time
%d Day (leading zeros) (01 to 31)
%H 24 hour (leading zeros) (00 to 23)
%I 12 hour (leading zeros) (01 to 12)
%j Day of year (001 to 366)
%m Month (01 to 12)
%M Minute (00 to 59)
%p AM or PM
%S Second (00 to 61⁴)
%U Week number¹ (00 to 53)
%w Weekday² (0 to 6)
%W Week number³ (00 to 53)
%x Date
%X Time
%y Year without century (00 to 99)
%Y Year (2008)
%Z Time zone (GMT)
%% A literal "­%" character (%)

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.

 

Share This Cheat Sheet!

Favourited by 39 Members:

CyberTron xcjjzh arnoldobr anomalophobe manoelhc shikee akuiraz naesk sschaub Provaguest sebbu blebo ajumell docdocsteve fire9 vonkes onitek RboPilot Plastefuchs martinku sturtus Huskeraider itbuddha asafge MrOggy85 cpriest akipta orx57 Coldblackice Eric Normandeau Swahilikid Theosis internaciulo gmickd amitb2050 puresky ThibaultGomarin martinprins guslong

Comments

Brent Hoover Brent Hoover, 07:45 6 Dec 11

This is a great cheatsheet. I'd add a few things, though I don't know what I would remove. I'd add dictionary methods, built-in functions (http://docs.python.org/library/functions.html), and the regular expression functions, since they are odd and I can never remember which one returns what.

Mike Mike, 08:01 17 Sep 12

Hi Dave, thanks for the opensource information. From a Newbie Pythionista wannabe

Desiree Desiree, 21:43 11 Oct 12

Thank you, Dave, for your generosity. This will be helpful in a course I'm taking on 'Programming Fundamentals with Python'.

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.