Python Programming Essentials - M9 - String Formatting

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String formatting
Pavan Verma
Python Programming Essentials
@YinYangPavan

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Formatting strings
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>>> name = "Monty Python"
>>> "Python is named after %s" % name
'Python is named after Monty Python'
>>> age = 12
>>> "this cat is %d years old" % age
'this cat is 12 years old'
Python uses
placeholders to
format strings
Strings: %s
Numbers: %d
Float: %f

Formatting strings (2)
3
>>> os = "Android"
>>> version = 4.2
>>> "my phone uses %s %d" % (os, version)
'my phone uses Android 4'
>>> "The value of Pi is %f" % 3.141592
'The value of Pi is 3.141592'
>>> "The value of Pi is %.2f" % 3.141592
'The value of Pi is 3.14'
Use of % operator has been deprecated in Python 3.x

Formatting strings with % operator
4
Use of % operator has been deprecated in Python 3.x

format() method
5
>>> 'this is a sample {0}'.format('string')
'this is a sample string'
str.format()
Strings have an inbuilt method format
used to format strings

Accessing arguments by position
6
>>> os = 'Android'
>>> version = 4.2
>>> 'phone uses {0} version {1}'.format(
os, version)
'phone uses Android version 4.2'
>>> 'version no:{1} os:{0}'.format(os, version)
'version no:4.2 os:Android'
>>> '{0} v{1} version {1}'.format(os, version)
'Android v4.2 version 4.2'

Accessing arguments by name
7
>>> 'phone uses {os} version {ver}'.format(
os='ios', ver=7.0)
'phone uses ios version 7.0‘
>>> 'phone uses {os} version {ver}'.format(
ver=4.2, os='android')
'phone uses android version 4.2'

Resources
 String formatting examples
http://docs.Python.org/2/library/string.html#format-examples
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Python Programming Essentials - M9 - String Formatting

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