String isdecimal() Method

String isdecimal() Method in Python 3

The isdecimal() method checks whether the string consists of only decimal characters.This method are present only on unicode objects.

Note: Unlike in Python 2, all strings are represented as Unicode in Python 3. Given Below is an example illustrating it.

Syntax

str.isdecimal()

Return Value

This method returns true if all the characters in the string are decimal, false otherwise.

Example

#!/usr/bin/python3 str = "this2016" print (str.isdecimal()) str = "23443434" print (str.isdecimal())

Result

False True

String zfill() Method

String zfill() Method in Python 3

The zfill() method pads string on the left with zeros to fill width.

Syntax

str.zfill(width)

Parameters

width - This is final width of the string. This is the width which we would get after filling zeros.

Return Value

This method returns padded string.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print ("str.zfill : ",str.zfill(40)) print ("str.zfill : ",str.zfill(50))

Result

str.zfill : 00000000this is string example....wow!!! str.zfill : 000000000000000000this is string example....wow!!!

String upper() Method

String upper() Method in Python 3

The upper() method returns a copy of the string in which all case-based characters have been uppercased.

Syntax

str.upper()

Return Value

This method returns a copy of the string in which all case-based characters have been uppercased.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print ("str.upper : ",str.upper())

Result

str.upper : THIS IS STRING EXAMPLE....WOW!!!

String translate() Method

String translate() Method in Python 3

The method translate() returns a copy of the string in which all the characters have been translated using table (constructed with the maketrans() function in the string module),optionally deleting all characters found in the string deletechars.

Syntax

str.translate(table[, deletechars]);

Parameters

· table - You can use the maketrans() helper function in the string module to create a translation table.

· deletechars - The list of characters to be removed from the source string.

Return Value

This method returns a translated copy of the string.

Example

The following example shows the usage of translate() method. Under this, every vowel in a string is replaced by its vowel position.

#!/usr/bin/python3 from string import maketrans # Required to call maketrans function. intab = "aeiou" outtab = "12345" trantab = maketrans(intab, outtab) str = "this is string example....wow!!!"; print (str.translate(trantab))

Result

th3s 3s str3ng 2x1mpl2....w4w!!!

Following is the example to delete 'x' and 'm' characters from the string-

#!/usr/bin/python3 from string import maketrans # Required to call maketrans function. intab = "aeiouxm" outtab = "1234512" trantab = maketrans(intab, outtab) str = "this is string example....wow!!!"; print (str.translate(trantab))

Result

th3s 3s str3ng 21pl2....w4w!!!

String title() Method

String title() Method in Python 3

The title() method returns a copy of the string in which first characters of all the words are capitalized.

Syntax

str.title();

Return Value

This method returns a copy of the string in which first characters of all the words are capitalized.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print (str.title())

Result

This Is String Example....Wow!!!

String swapcase() Method

String swapcase() Method in Python 3

The swapcase() method returns a copy of the string in which all the case-based

characters have had their case swapped.

Syntax

str.swapcase();

Return Value

This method returns a copy of the string in which all the case-based characters have had their case swapped.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print (str.swapcase()) str = "This Is String Example....WOW!!!" print (str.swapcase())

Result

THIS IS STRING EXAMPLE....WOW!!! tHIS iS sTRING eXAMPLE....wow!!!

String strip() Method

String strip() Method in Python 3

The strip() method returns a copy of the string in which all chars have been stripped from the beginning and the end of the string (default whitespace characters).

Syntax

str.strip([chars]);

Parameters

chars - The characters to be removed from beginning or end of the string.

Return Value

This method returns a copy of the string in which all the chars have been stripped from the beginning and the end of the string.

Example

#!/usr/bin/python3 str = "*****this is string example....wow!!!*****" print (str.strip( '*' ))

Result

this is string example....wow!!!

String startswith() Method

String startswith() Method in Python 3

The startswith() method checks whether the string starts with str, optionally restricting the matching with the given indices start and end.

Syntax

str.startswith(str, beg=0,end=len(string));

Parameters

· str - This is the string to be checked.

· beg - This is the optional parameter to set start index of the matching boundary.

· end - This is the optional parameter to set start index of the matching boundary.

Return Value

This method returns true if found matching with the string otherwise false.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print (str.startswith( 'this' )) print (str.startswith( 'string', 8 )) print (str.startswith( 'this', 2, 4 ))

Result

True True False

String splitlines() Method

String splitlines() Method in Python 3

The splitlines() method returns a list with all the lines in string, optionally including the line breaks (if num is supplied and is true).

Syntax

str.splitlines( num=string.count('\n'))

Parameters

num - This is any number, if present then it would be assumed that the line breaks need to be included in the lines.

Return Value

This method returns true if found matching with the string otherwise false.

Example

#!/usr/bin/python3 str = "this is \nstring example....\nwow!!!" print (str.splitlines( ))

Result

['this is ', 'string example....', 'wow!!!']

String split() Method

String split() Method in Python 3

The split() method returns a list of all the words in the string, using str as the separator (splits on all whitespace if left unspecified), optionally limiting the number of splits to num.

Syntax

str.split(str="", num=string.count(str)).

Parameters

· str - This is any delimeter, by default it is space.

· num - this is number of lines to be made

Return Value

This method returns a list of lines.

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print (str.split( )) print (str.split('i',1)) print (str.split('w'))

Result

['this', 'is', 'string', 'example....wow!!!'] ['th', 's is string example....wow!!!'] ['this is string example....', 'o', '!!!']

String rstrip() Method

String rstrip() Method in Python 3

The rstrip() method returns a copy of the string in which all chars have been stripped from the end of the string (default whitespace characters).

Syntax

str.rstrip([chars])

Parameters

chars - You can supply what chars have to be trimmed.

Return Value

This method returns a copy of the string in which all chars have been stripped from the end of the string (default whitespace characters).

Example

#!/usr/bin/python3 str = " this is string example....wow!!! " print (str.rstrip()) str = "*****this is string example....wow!!!*****" print (str.rstrip('*'))

Result

this is string example....wow!!! *****this is string example....wow!!!

String rjust() Method

String rjust() Method in Python 3

The rjust() method returns the string right justified in a string of length width. Padding is done using the specified fillchar (default is a space). The original string is returned if width is less than len(s).

Syntax

str.rjust(width[, fillchar])

Parameters

· width - This is the string length in total after padding.

· fillchar - This is the filler character, default is a space.

Return Value

This method returns the string right justified in a string of length width. Padding is done using the specified fillchar (default is a space). The original string is returned if the width is less than len(s).

Example

#!/usr/bin/python3 str = "this is string example....wow!!!" print (str.rjust(50, '*'))

Result

******************this is string example....wow!!!

String rindex() Method

String rindex() Method in Python 3

The rindex() method returns the last index where the substring str is found, or raises an exception if no such index exists, optionally restricting the search to string[beg:end].

Syntax

str.rindex(str, beg=0 end=len(string))

Parameters

· str - This specifies the string to be searched.

· beg - This is the starting index, by default its 0.

· len - This is ending index, by default its equal to the length of the string.

Return Value

This method returns last index if found otherwise raises an exception if str is not found.

Example

#!/usr/bin/python3 str1 = "this is really a string example....wow!!!" str2 = "is" print (str1.rindex(str2)) print (str1.rindex(str2,10))

Result

5 Traceback (most recent call last): File "test.py", line 5, in print (str1.rindex(str2,10)) ValueError: substring not found

String rfind() Method

String rfind() Method in Python 3

The rfind() method returns the last index where the substring str is found, or -1 if no such index exists, optionally restricting the search to string[beg:end].

Syntax

str.rfind(str, beg=0 end=len(string))

Parameters

· str - This specifies the string to be searched.

· beg - This is the starting index, by default its 0.

· end - This is the ending index, by default its equal to the length of the string.

Return Value

This method returns last index if found and -1 otherwise.

Example

#!/usr/bin/python3 str1 = "this is really a string example....wow!!!" str2 = "is" print (str1.rfind(str2)) print (str1.rfind(str2, 0, 10)) print (str1.rfind(str2, 10, 0)) print (str1.find(str2)) print (str1.find(str2, 0, 10)) print (str1.find(str2, 10, 0))

Result

5 5 -1 2 2 -1