Python zip() Function

PythonServer Side ProgrammingProgramming

zip() function is used to group multiple iterators. Look at the doc of the zip() function using help method. Run the following code to get the help on zip() function.

Example

 Live Demo

help(zip)

If you run the above program, you will get the following results.

Output

Help on class zip in module builtins:
class zip(object)
   | zip(iter1 [,iter2 [...]]) --> zip object
   |
   | Return a zip object whose .__next__() method returns a tuple where
   | the i-th element comes from the i-th iterable argument. The .__next__()
   | method continues until the shortest iterable in the argument sequence
   | is exhausted and then it raises StopIteration.
   |
   | Methods defined here:
   |
   | __getattribute__(self, name, /)
   | Return getattr(self, name).
   |
   | __iter__(self, /)
   | Implement iter(self).
   |
   | __new__(*args, **kwargs) from builtins.type
   | Create and return a new object. See help(type) for accurate signature.
   |
   | __next__(self, /)
   | Implement next(self).
   |
   | __reduce__(...)
   | Return state information for pickling.

Let's see a simple example of how it works?

Example

 Live Demo

## initializing two lists
names = ['Harry', 'Emma', 'John']
ages = [19, 20, 18]
## zipping both
## zip() will return pairs of tuples with corresponding elements from both lists
print(list(zip(names, ages)))

If you run the above program, you will get the following results

Output

[('Harry', 19), ('Emma', 20), ('John', 18)]

We can also unzip the elements from the zipped object. We have to pass the object with a preceding * to the zip() function. Let's see.

Example

 Live Demo

## initializing two lists
names = ['Harry', 'Emma', 'John']
ages = [19, 20, 18]
## zipping both
## zip() will return pairs of tuples with corresponding elements from both lists
zipped = list(zip(names, ages))
## unzipping
new_names, new_ages = zip(*zipped)
## checking new names and ages
print(new_names)
print(new_ages)

If you run the above program, you will get the following results.

('Harry', 'Emma', 'John')
(19, 20, 18)

General Usage Of zip()

We can use it to print the multiple corresponding elements from different iterators at once. Let's look at the following example.

Example

 Live Demo

## initializing two lists
names = ['Harry', 'Emma', 'John']
ages = [19, 20, 18]
## printing names and ages correspondingly using zip()
for name, age in zip(names, ages):
print(f"{name}'s age is {age}")

If you run the above program, you will get the following results.

Output

Harry's age is 19
Emma's age is 20
John's age is 18
raja
Published on 08-Jul-2019 13:43:31
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