This Python tutorial will show you how to join strings arrays. The string method join() returns a string concatenated with the elements of an iterable.
It concatenates each element of an iterable (such as a list, string, or tuple) to the string and returns the result.
The syntax of join() is:
string.join(iterable)
If the iterable contains any non-string values, a TypeError exception is thrown..
Whereas join() Parameters is:
- iterable – Objects that can return its members one at a time. Iterables include List, Tuple, String, Dictionary, and Set..
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Join Array String
Let’s create a string array and join with separator.
numList = ['5', '7', '8', '10'] seperator = ', ' print(seperator.join(numList))
Output:
5, 7, 8, 10
Join Array Tuple
We’ll create a string array and join with separator.
numTuple = ('5', '7', '9', '13')
seperator = ', '
print(seperator.join(numTuple))Output:
5, 7, 9, 13
Join with String Seperater
We can also use more than one character string as a separator.
s1 = 'adam'
s2 = '345'
""" Each character of s2 is concatenated to the front of s1"""
print('s1.join(s2):', s1.join(s2))Output:
s1.join(s2): 3adam4adam5
String Joins on Object Array
The built-in string constructor will automatically call obj.str:
''.join(map(str,list))
String Join With Sets
We can also apply join method on sets. Let’s take a look simple example –
seta = {'7', '5', '3'}<br>
s = ', '<br>
print(s.join(seta))Output:
5, 7, 3
join() method with dictionaries?
The join() method also work with dictionaries. Let’s create dictionaries and apply join –
dic = {'fname': 'adam', 'lname': 'joe'}
s = ', '
print(s.join(dic))<strong>Output:</strong> fname, lname
The join() method tries to concatenate the key (not value) of the dictionary to the string. If the key of the string is not a string, it raises TypeError exception.