Python Tutorial

Python join list elements with separator

Join function is most useful in python which adds all items of list into a string by a specified separator

The join() is a string method which returns a string concatenated with the elements of an iterable.

Example 1:

# list of words
words = ['This','is','a','sentence']

#delimiter to seperate each word
seperator = ' '

#concat all together
sentence = seperator.join(words)
print(sentence) 

output: This is a sentence

Parameters: The join() method takes iterable – objects capable of returning its members one at a time.

Some examples are List, Tuple, String, Dictionary and Set

Return Value: The join() method returns a string concatenated with the elements of iterable.

Type Error: If the iterable contains any non-string values, it raises a TypeError exception.

Example 2: Join method is useful when you are reading file

Here is student.csv file data

stud_id,firstname,middlename,lastname 1, Jitendra, kumar, Singh 2, Aman, Kumar, Singh

file = open('student.csv')
line = file.readLine()

while line:
    words = line.split(',')
    # adding only last three fields
    fullName = " ".join(words[1:])
    print(fullName)

output: Jitendra kumar singh
        Aman kumar Singh

Hope this will be helpful