In this article, we will discuss how to use enumerate() and zip() functions in python.
Python enumerate() is used to convert into a list of tuples using the list() method.
Syntax:
enumerate(iterable, start=0)
Parameters:
- Iterable: any object that supports iteration
- Start: the index value from which the counter is to be started, by default it is 0
Python zip() method takes iterable or containers and returns a single iterator object, having mapped values from all the containers.
Syntax:
zip(*iterators)
Using Both, we can iterate two/more lists/objects by using enumerate and zip functions at a time.
Syntax:
enumerate(zip(list1,list2,.,list n))
We can iterate this in for loop.
Syntax:
for var1,var2,.,var n in enumerate(zip(list1,list2,..,list n))
where,
- list1,list2 ,. are the input lists
- var1 , var2,… are the iterators to iterate the lists
Example: Using enumerate() and zip() together in Python
Python3
# create a list of names names = ['sravan', 'bobby', 'ojaswi', 'rohith', 'gnanesh'] # create a list of subjects subjects = ['java', 'python', 'R', 'cpp', 'bigdata'] # create a list of marks marks = [78, 100, 97, 89, 80] # use enumerate() and zip() function # to iterate the lists for i, (names, subjects, marks) in enumerate(zip(names, subjects, marks)): print(i, names, subjects, marks) |
Output:
0 sravan java 78 1 bobby python 100 2 ojaswi R 97 3 rohith cpp 89 4 gnanesh bigdata 80
We can also do this by using tuple(t)
Syntax:
for i, t in enumerate(zip(names, subjects,marks))
Its returns the data in the tuple format
Example: Using enumerate() and zip() together in Python
Python3
# create a list of names names = ['sravan', 'bobby', 'ojaswi', 'rohith', 'gnanesh'] # create a list of subjects subjects = ['java', 'python', 'R', 'cpp', 'bigdata'] # create a list of marks marks = [78, 100, 97, 89, 80] # use enumerate() and zip() function # to iterate the lists with t function for i, t in enumerate(zip(names, subjects, marks)): print(i, t) |
Output:
0 ('sravan', 'java', 78)
1 ('bobby', 'python', 100)
2 ('ojaswi', 'R', 97)
3 ('rohith', 'cpp', 89)
4 ('gnanesh', 'bigdata', 80)
we can also use t[index] in the above approach to get output
Example: Using enumerate() and zip() together in Python
Python3
# create a list of names names = ['sravan', 'bobby', 'ojaswi', 'rohith', 'gnanesh'] # create a list of subjects subjects = ['java', 'python', 'R', 'cpp', 'bigdata'] # create a list of marks marks = [78, 100, 97, 89, 80] # use enumerate() and zip() function # to iterate the lists with t function for i, t in enumerate(zip(names, subjects, marks)): print(i, t[0], t[1], t[2]) |
Output:
0 sravan java 78 1 bobby python 100 2 ojaswi R 97 3 rohith cpp 89 4 gnanesh bigdata 80
