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In Python 2 you get
>>> from string import * >>> letters 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' But in Python 3, you get
>>> from string import * >>> letters Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'letters' is not defined It's not defined, whereas digits and whitespace are.
What is the equivalence of letters from the string module in Python 3?
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In Python 2, the str type was used for two different kinds of values – text and bytes, whereas in Python 3, these are separate and incompatible types. Text contains human-readable messages, represented as a sequence of Unicode codepoints. Usually, it does not contain unprintable control characters such as \0 .
You can use ( > , < , <= , <= , == , != ) to compare two strings. Python compares string lexicographically i.e using ASCII value of the characters.
Use the in operator for partial matches, i.e., whether one string contains the other string. x in y returns True if x is contained in y ( x is a substring of y ), and False if it is not. If each character of x is contained in y discretely, False is returned.
Each character will have its own integer value, and the value differs for uppercase and lowercase characters.
Try using: string.ascii_letters instead of just letters, here.
More information here: http://docs.python.org/release/3.1.3/library/string.html#string-constants
Update:
As @wim noted in the previously posted comment, this suggestion to use string.ascii_letters in Python 3 is not equivalent to the letters in Python 2. Like wim noted, string.ascii_letters is not locale-dependent while letters is locale-dependent.
I hope this suggestion can still be helpful, though, but wanted to include the feedback from @wim and the docs.
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