Python sys Variables

variablemeaning
argvCommand line args
builti­n_m­odu­le_­namesLinked C modules
byteorderNative byte order
check_­int­ervalSignal check frequency
exec_p­refixRoot directory
executableName of executable
exitfuncExit function name
modulesLoaded modules
pathSearch path
platformCurrent platform
stdin, stdout, stderrFile objects for I/O
versio­n_infoPython version info
winverVersion number

Python sys.argv

sys.argv for the command:

python foo.py bar -c qux --h
sys.argvpart of the command
sys.ar­gv[0]foo.py
sys.ar­gv[1]bar
sys.ar­gv[2]-c
sys.ar­gv[3]qux
sys.ar­gv[4]–h

Python os Variables

OS Variablemeaning
altsepAltern­ative sep
curdirCurrent dir string
defpathDefault search path
devnullPath of null device
extsepExtension separator
linesepLine separator
nameName of OS
pardirParent dir string
pathsepPatch separator
sepPath separator

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() : for 8-bit strings
  • 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() : for 8-bit strings
  • split(sep)
  • isalpha() : for 8-bit strings
  • splitl­ines()
  • isdigit() : for 8-bit strings
  • starts­wit­h(sub)
  • islower() : for 8-bit strings
  • strip()
  • isspace() : for 8-bit strings
  • swapcase() : for 8-bit strings
  • istitle() : for 8-bit strings
  • title() : for 8-bit strings
  • isupper() : for 8-bit strings
  • transl­ate­(table)
  • join()
  • upper() : for 8-bit strings
  • ljust(­width)
  • zfill(­width)
  • lower() : 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

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

slicesmeaning
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

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

FormatMeaning
%aAbbrev­iated weekday (Sun)
%AWeekday (Sunday)
%bAbbrev­iated month name (Jan)
%BMonth name (January)
%cDate and time
%dDay (leading zeros) (01 to 31)
%H24 hour (leading zeros) (00 to 23)
%I12 hour (leading zeros) (01 to 12)
%jDay of year (001 to 366)
%mMonth (01 to 12)
%MMinute (00 to 59)
%pAM or PM
%SSecond (00 to 61)
%UWeek number (00 to 53)
%wWeekday (0 to 6)
%WWeek number (00 to 53)
%xDate
%XTime
%yYear without century (00 to 99)
%YYear (2008)
%ZTime zone (GMT)
%%A literal “­%” character (%)

That’s it. Hope it helps.