Python Programming Essentials - M9 - String Formatting
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This document discusses string formatting in Python. It explains that Python uses placeholders like %s and %d to format strings with values. The % operator method of string formatting is deprecated in Python 3 and the str.format() method is recommended instead. The format() method allows accessing formatting arguments by position or name to customize the order and labels of values in formatted strings.
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- 2. © SkillBrew http://skillbrew.com Formatting strings 2 >>> 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
- 3. © SkillBrew http://skillbrew.com 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
- 4. © SkillBrew http://skillbrew.com Formatting strings with % operator 4 Use of % operator has been deprecated in Python 3.x
- 5. © SkillBrew http://skillbrew.com 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
- 6. © SkillBrew http://skillbrew.com 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'
- 7. © SkillBrew http://skillbrew.com 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'
- 8. © SkillBrew http://skillbrew.com Resources String formatting examples http://docs.Python.org/2/library/string.html#format-examples 8
- 9. 9
Editor's Notes
- #7: Positioning of arguments is critical (1st snippet and 2nd snippet in this slide)