Python

Data Types

 
int 1234
>>> type(1234)
<class 'int'>
float 55.50
>>> type(55.50)
<class 'float'>
complex
>>> type(6+4j)
<class 'complex'>
string hellow
>>> type("hello")
<class 'str'>
Square list [1,2,3,4]
>>> type([1,2,3,4])
<class 'list'>
Round tuple (1,2,3,4)
>>> type((1,2,3,4))
<class 'tuple'>
Curly dict {1:"one", 2:"two", 3:"three"}
>>> type({1:"one", 2:"two", 3:"three"})
<class 'dict'>

Python version of a perl hash

import collections

; def tree() : return collections.defaultdict(tree)

hash = tree()

hash[['outer_key']][['inner key']] = "value"


; if not bool(hash) : print "Hash is empty"
; else : print "Hash has some data"

Strings

• Use "'{0}' is longer than '{1}'".format(name1, name2)

• The new-style {} formatting uses {} codes and the .format method
• 'It will cost ${0} dollars.'.format(95)
• The old-style % formatting uses % codes for formatting:
• 'It will cost $%d dollars.' % 95
• Note that with old-style formatting, you have to specify multiple arguments using a tuple:
• '%d days and %d nights' % (40, 40)