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/ modules / string.py
Common string manipulations.
Public module variables:
- whitespace
- a string containing all characters considered whitespace
lowercase -- a string containing all characters considered lowercase letters
uppercase -- a string containing all characters considered uppercase letters
letters -- a string containing all characters considered letters
digits -- a string containing all characters considered decimal digits
hexdigits -- a string containing all characters considered hexadecimal digits
octdigits -- a string containing all characters considered octal digits
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Functions
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upper
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upper ( s )
upper(s) -> string
Return a copy of the string s converted to uppercase.
Convert lower case letters to UPPER CASE
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lstrip
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lstrip ( s )
lstrip(s) -> string
Return a copy of the string s with leading whitespace removed.
Strip leading tabs and spaces
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replace
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replace (
s,
old,
new,
maxsplit=-1,
)
replace (str, old, new[, maxsplit]) -> string
Return a copy of string str with all occurrences of substring
old replaced by new. If the optional argument maxsplit is
given, only the first maxsplit occurrences are replaced.
Substring replacement (global)
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capwords
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capwords ( s, sep=None )
capwords(s, [sep]) -> string
Split the argument into words using split, capitalize each
word using capitalize, and join the capitalized words using
join. Note that this replaces runs of whitespace characters by
a single space.
Capitalize the words in a string, e.g. " aBc dEf " -> "Abc Def".
See also regsub.capwords().
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rfind
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rfind ( s, *args )
rfind(s, sub [,start [,end]]) -> int
Return the highest index in s where substring sub is found,
such that sub is contained within s[start,end]. Optional
arguments start and end are interpreted as in slice notation.
Return -1 on failure.
Find last substring, return -1 if not found
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strip
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strip ( s )
strip(s) -> string
Return a copy of the string s with leading and trailing
whitespace removed.
Strip leading and trailing tabs and spaces
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ljust
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ljust ( s, width )
ljust(s, width) -> string
Return a left-justified version of s, in a field of the
specified width, padded with spaces as needed. The string is
never truncated.
Left-justify a string
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find
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find ( s, *args )
find(s, sub [,start [,end]]) -> in
Return the lowest index in s where substring sub is found,
such that sub is contained within s[start,end]. Optional
arguments start and end are interpreted as in slice notation.
Return -1 on failure.
Find substring, return -1 if not found
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index
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index ( s, *args )
index(s, sub [,start [,end]]) -> int
Like find but raises ValueError when the substring is not found.
Find substring, raise exception if not found
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rindex
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rindex ( s, *args )
rindex(s, sub [,start [,end]]) -> int
Like rfind but raises ValueError when the substring is not found.
Find last substring, raise exception if not found
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capitalize
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capitalize ( s )
capitalize(s) -> string
Return a copy of the string s with only its first character
capitalized.
Capitalize a string, e.g. "aBc dEf" -> "Abc def".
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split
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split (
s,
sep=None,
maxsplit=-1,
)
split(str [,sep [,maxsplit]]) -> list of strings
Return a list of the words in the string s, using sep as the
delimiter string. If maxsplit is nonzero, splits into at most
maxsplit words If sep is not specified, any whitespace string
is a separator. Maxsplit defaults to -1.
(split and splitfields are synonymous)
Split a string into a list of space/tab-separated words
NB: split(s) is NOT the same as splitfields(s, )!
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rstrip
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rstrip ( s )
rstrip(s) -> string
Return a copy of the string s with trailing whitespace
removed.
Strip trailing tabs and spaces
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translate
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translate (
s,
table,
deletions="",
)
translate(s,table [,deletechars]) -> string
Return a copy of the string s, where all characters occurring
in the optional argument deletechars are removed, and the
remaining characters have been mapped through the given
translation table, which must be a string of length 256.
Character translation through look-up table.
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rjust
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rjust ( s, width )
rjust(s, width) -> string
Return a right-justified version of s, in a field of the
specified width, padded with spaces as needed. The string is
never truncated.
Right-justify a string
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swapcase
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swapcase ( s )
swapcase(s) -> string
Return a copy of the string s with upper case characters
converted to lowercase and vice versa.
Swap lower case letters and UPPER CASE
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atoi
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atoi ( *args )
atoi(s [,base]) -> int
Return the integer represented by the string s in the given
base, which defaults to 10. The string s must consist of one
or more digits, possibly preceded by a sign. If base is 0, it
is chosen from the leading characters of s, 0 for octal, 0x or
0X for hexadecimal. If base is 16, a preceding 0x or 0X is
accepted.
Convert string to integer
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Exceptions
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TypeError( 'argument 1: expected string, %s found' % type( s ).__name__ )
TypeError('function requires at least 1 argument: %d given' % len( args ) )
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zfill
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zfill ( x, width )
zfill(x, width) -> string
Pad a numeric string x with zeros on the left, to fill a field
of the specified width. The string x is never truncated.
Zero-fill a number, e.g., (12, 3) --> 012 and (-3, 3) --> -03
Decadent feature: the argument may be a string or a number
(Use of this is deprecated; it should be a string as with ljust c.s.)
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atol
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atol ( *args )
atol(s [,base]) -> long
Return the long integer represented by the string s in the
given base, which defaults to 10. The string s must consist
of one or more digits, possibly preceded by a sign. If base
is 0, it is chosen from the leading characters of s, 0 for
octal, 0x or 0X for hexadecimal. If base is 16, a preceding
0x or 0X is accepted. A trailing L or l is not accepted,
unless base is 0.
Convert string to long integer
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Exceptions
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TypeError( 'argument 1: expected string, %s found' % type( s ).__name__ )
TypeError('function requires at least 1 argument: %d given' % len( args ) )
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atof
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atof ( s )
atof(s) -> float
Return the floating point number represented by the string s.
Convert string to float
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Exceptions
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TypeError( 'argument 1: expected string, %s found' % type( s ).__name__ )
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count
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count ( s, *args )
count(s, sub[, start[,end]]) -> int
Return the number of occurrences of substring sub in string
s[start:end]. Optional arguments start and end are
interpreted as in slice notation.
Count non-overlapping occurrences of substring
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lower
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lower ( s )
lower(s) -> string
Return a copy of the string s converted to lowercase.
convert UPPER CASE letters to lower case
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join
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join ( words, sep=' ' )
join(list [,sep]) -> string
Return a string composed of the words in list, with
intervening occurences of sep. The default separator is a
single space.
(joinfields and join are synonymous)
Join fields with optional separator
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center
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center ( s, width )
center(s, width) -> string
Return a center version of s, in a field of the specified
width. padded with spaces as needed. The string is never
truncated.
Center a string
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expandtabs
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expandtabs ( s, tabsize=8 )
expandtabs(s [,tabsize]) -> string
Return a copy of the string s with all tab characters replaced
by the appropriate number of spaces, depending on the current
column, and the tabsize (default 8).
Expand tabs in a string.
Doesn't take non-printing chars into account, but does understand \n.
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maketrans
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maketrans ( fromstr, tostr )
maketrans(frm, to) -> string
Return a translation table (a string of 256 bytes long)
suitable for use in string.translate. The strings frm and to
must be of the same length.
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Exceptions
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ValueError, "maketrans arguments must have same length"
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