CODEWITHSUNDEEP
python-3.x
Syed Ahmed
Syed Ahmed

Reputation: 209

Inserting an element at the first position in every individual list of a list of a list

I have a simple problem. I need to insert an element from a list at the first position of every individual list, of a list of a list.

I tried it using the code mentioned below but it doesn't give the required_output

for i in bank_name_list:
    for j in dummy_list:
        j.insert(0,i)
print(dummy_list)

bank_name_list = ['Bank1', 'Bank2']

dummy_list = [[2,4,5],[5,6,8]]

actual_output = [['Bank2', 'Bank1', 2, 4, 5], ['Bank2', 'Bank1', 5, 6, 8]]

required_output = [['Bank1',2,4,5],['Bank2',5,6,8]]

Upvotes: 0

Views: 40

Answers (3)

Kaushal Pahwani
Kaushal Pahwani

Reputation: 474

Simple and pythonic, try this out:

bank_name_list = ['Bank1', 'Bank2']
dummy_list = [[2,4,5],[5,6,8]]
output = []
for item in zip(bank_name_list, dummy_list):
    output.append([item[0],*item[1]])

print(output)

Upvotes: 0

saintlyzero
saintlyzero

Reputation: 1852

Solution:


bank_name_list = ['Bank1', 'Bank2']
dummy_list = [[2,4,5],[5,6,8]]
bank_name_list
for index, sub_list in enumerate(dummy_list):
    sub_list.insert(0,bank_name_list[index])

print(dummy_list)

Output: 

[['Bank1', 2, 4, 5], ['Bank2', 5, 6, 8]]

But this approach works only if both bank_name_list and dummy_list have same length

Upvotes: 0

Rakesh
Rakesh

Reputation: 82765

Use zip

Ex:

bank_name_list = ['Bank1', 'Bank2']
dummy_list = [[2,4,5],[5,6,8]]

result = []
for bank, dummy in zip(bank_name_list, dummy_list):
    result.append([bank] + dummy)
print(result)

Output:

[['Bank1', 2, 4, 5], ['Bank2', 5, 6, 8]]

Upvotes: 1

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