将字符串列表转换为元组列表

Question

I want to convert a list [bird, cake, day] to [(bird, 4), (cake, 4), (day, 3)] which is [(element, len(element))] format.

I did

for element in a_list:
    element = tuple(element, len(element))

but getting tuple() takes at most 1 argument (2 given) error.

How can I fix this?

Answer 1

your getting that error because your passing two args to tuple(), this should work:

[tuple((element, len(element))) for element in a_list]

or shorter:

[(element, len(element)) for element in a_list]

Answer 2

lst1 = ['bird', 'cake', 'day']
lst2 = [(i, len(i)) for i in lst1]
print(lst2)

OUT:

[('bird', 4), ('cake', 4), ('day', 3)]

Answer 3

I assumed your a_list is string. This works.

a_list = ["bird", "cake", "day"]
new_list = []

for element in a_list:
    new_list.append([element, len(element)])

print(new_list)

[['bird', 4], ['cake', 4], ['day', 3]]

The reason your code is not working is you updating the element reference in the for loop. Which is not an identical reference to the value in the a_list .

Answer 4

Try this using list comprehension:

element = ["bird", "cake", "day"]
new_list = [(i, len(i)) for i in element]
print(new_list)