# Python - Group contiguous strings in List

PythonServer Side ProgrammingProgramming

When it is required to group the contiguous elements of a string that are present in a list, a method is defined that uses ‘groupby’, and ‘yield’.

## Example

Below is a demonstration of the same

from itertools import groupby

def string_check(elem):
return isinstance(elem, str)

def group_string(my_list):

for key, grp in groupby(my_list, key=string_check):
if key:
yield list(grp)
else:
yield from grp
my_list = [52, 11, 'py', 'th', 'on', 11, 52, 'i', 's', 18, 'f', 'un', 99]

print("The list is :")
print(my_list)

my_result = [*group_string(my_list)]

print("The result is:")
print(my_result)

## Output

The list is :
[52, 11, 'py', 'th', 'on', 11, 52, 'i', 's', 18, 'f', 'un', 99]
The result is:
[52, 11, ['py', 'th', 'on'], 11, 52, ['i', 's'], 18, ['f', 'un'], 99]

## Explanation

• A method named ‘string_check’ is defined that takes a list as parameter and checks to see if it belongs to a certain instance type.

• Another method named ‘group_string’ is defined that takes a list as parameter and uses yield to return the output using ‘groupby’ method.

• Outside the method, a list is defined and is displayed on the console.

• The ‘group_string’ is called and the result is assigned to a variable.

• This is displayed as output on the console.

Updated on 21-Sep-2021 07:52:58

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