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Safari | Python Developer's Handbook -> The String Group





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The String Group

This group is responsible for many kinds of string services available. These modules provide access to several types of string manipulation operations.

Note that since release 2.0, all these functions are tied directly to string objects, as methods. The string module is still around only for backward compatibility.

string

The string module supports common string operations by providing several functions and constants that manipulate Python strings.

string.split()

This function splits a string into a list. If the delimiter is omitted, white-spaces are used.

basic syntax: string.split(string [,delimiter])

							
>>> print string,split("a b c")
["a","b","c"]

						
string.atof()

It converts a string to a floating number.

basic syntax: string.atof(string)

string.atoi()

It converts a string to an integer. atoi takes an optional second argument: base. If omitted, the start of the string (for instance, 0x for hexadecimal) is used to determine the base.

basic syntax: string.atoi(string[, base])

string.atol()

It converts a string to a long integer. atol takes an optional second argument: base. If omitted, the start of the string (for instance, 0x for hexadecimal) is used to determine the basic syntax: string.atol(string[, base])

string.upper()

It converts a string to uppercase.

basic syntax: string.upper(string)

string.find()

It returns the index position of the substring within string. Optionally, you can specify the string's range that should be used in the search.

basic syntax: string.find(string, substring[, start [,end]])

string.join()

This function joins the string elements of a list using separator to separate them.

basic syntax: string.join(list, separator)

string.capitalize()

It capitalizes the first character of string.

basic syntax: string.capitalize(string)

string.capwords()

This function capitalizes the first letter of each word in string and removes repeated, leading, and trailing whitespace.

basic syntax: string.capwords(string)

string.lower()

It converts all characters in string to lowercase.

basic syntax: string.lower(string)

string.lstrip(),string.rstrip() and string.strip()

These functions remove leading and/or trailing whitespace from string.

basic syntaxes:

							
string.lstrip(string)
string.rstrip(string)
string.strip(string)

						
string.ljust(),string.rjust() and string.center()

These functions define the alignment of string within a variable of width characters.

basic syntaxes:

							
string.ljust(string, width)
string.rjust(string, width)
string.center(string, width)

						
string.replace()

It replaces a maximum number of occurrences of oldtext with newtext in string. If maximum is omitted, all occurrences are replaced.

basic syntax: string.replace(string, oldtext, newtext [,maximum])

string.zfill()

It inserts zeros on the left side of a string that has width characters.

basic syntax: string.zfill(string, width)

Next, I list a few constants that can be used to test whether a certain variable is part of a specific domain:

							
>>> import string
>>> string.digits
"0123456789"
>>> string.octdigits
"01234567"
>>> string.uppercase
"ABCDEFGHIJKLMNOPQRSTUVWXY"
>>> string.hexdigits
"0123456789abcdefABCDEF"
>>> string.lowercase
"abcdefghijklmnopqrstuvwxy"

						

Let's write an example that uses string.uppercase:

							
>>> text = "F"
>>> if text in string.uppercase:
     print "%s is in uppercase format" % text

"F is in uppercase format"

						
string.maketrans()

Returns a translation table that maps each character in the from string into the character at the same position in the ... ... (Not finished, please download and read the complete file)

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