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Python String | join() method with Examples

Python String join() method with Examples on capitalize(), center(), count(), encode(), find(), format(), index(), join(), lower(), ljust(), isupper(), istitle(), isspace(), isprintable(), isnumeric(), islower() etc.

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Python String join() Method

Python join() method is used to concat a string with iterable object. It returns a new string which is the concatenation of the strings in iterable. It throws an exception TypeError if iterable contains any non-string value.

It allows various iterables like: List, Tuple, String etc.

Signature

join(iterable)

Parameters

iterable : iterable object like: List, Tuple, String etc.

Return

It returns a new string or an exception TypeError if iterable contains any non-string value.

Let's see some examples of join() method to understand it's functionalities.

Python String join() Method Example 1

A simple example which implements join() method with the List iterable, see the example below.

# Python join() method example
# Variable declaration
str = ":"   # string
list = ['1','2','3']    # iterable
# Calling function
str2 = str.join(list)
# Displaying result
print(str2)

Output:

1:2:3

Python String join() Method Example 2

A list iterable join with empty string and produce a new string, see the example below

# Python join() method example
# Variable declaration
str = ""   # string
list = ['J','a','v','a','t','p','o','i','n','t']    # iterable
# Calling function
str2 = str.join(list)
# Displaying result
print(str2)

Output:

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Python String join() Method Example 3

An example of join() method with Set iterable. Set contains unordered elements and produce different output each times. See the example below.

# Python join() method example
# Variable declaration
str = "->"   # string
list = {'Java','C#','Python'}    # iterable
# Calling function
str2 = str.join(list)
# Displaying result
print(str2)

Output:

Java->Python->C#

Python String join() Method Example 4

In case of dictionary, this method join keys only. Make sure keys are string, otherwise it throws an exception.

# Python join() method example
# Variable declaration
dic =  {'key1': 1, 'key2': 2}
str = '&'
# Calling function
str = str.join(dic)
# Displaying result
print(str)

Output:

key1&key2

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