Python Join() Method with Examples

In this article, we will see what is Python Join method with examples. This Python join() method tutorial helps you in implementing this concept and get a tight grip over this. 

Python String join() Method

It allows an iterable as the input parameter and joins their elements into a string with some of the string separator such as comma, space, underscores, etc., We can also send a string value such as “ABC” or “XYZ” etc., It returns a string by concatenating all the elements of an iterable, separated by a string separator. It joins a sequence of types like List, Tuple, String, Dictionary, & Set and converts them into a String.

Join() Method Syntax:

Following is the syntax of join() method.

str.join(iterable)

String: str is the name of the string in which joined elements of iterable will be stored.
Parameter: Iterable is a parameter and we have to pass only iterable parameter. The returned values are strings. Some examples are List, Tuple, String, Dictionary, and Set.
Return Value: It returns a string by concatenating all the elements of an iterable, separated by a string separator.
Type Error: If the iterable contains any non-string values, it raises an exception called TypeError exception.

Python string method join() with Examples

Let’s move forward and see some examples using join method by taking a sequence of each data type one by one.

Example 1: The join() method with List as Iterable

# .join() with lists
list = ['1', '2', '3', '4']
separator = ', '
print(separator.join(list))

Output:

1, 2, 3, 4

Example 2: The join() method with Tuple as Iterable

# .join() with tuple
tuple = ("Software", "Testing", "Material")
seperator = '_'
output = seperator.join(tuple)
print(output)

Output:

Software_Testing_Material

Example 3: The join() method with dictionaries as Iterable

The join() can take a dict and concatenate all its key fields as one.

# .join() with dictionaries
inputDict = {'software': 1, 'testing': 2}
separator = '_'
Output = separator.join(inputDict)
print("After join: " + Output)
print("Join() return type: {}".format(type(Output)))

Output:

After join: software_testing
Join() return type: <class 'str'>

Example 4: The join() method with Set as Iterable

# .join() with sets
inputSet1 = {'2', '1', '3'}
separtor1 = ', '
print(separtor1.join(inputSet1))
inputSet2 = {'Java', 'Python', 'Ruby'}
separtor2 = '-'
print(separtor2.join(inputSet2))

Output:

1, 3, 2
Python-Java-Ruby

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