Can assignments be made as part of python list comprehension?

Question

Can a list comprehension be used instead of the for loop below?

shod_l = list() # Initialize a list for empty pd.DataFrames that will be used later for merging of api query results

for q in range(len(shod_list)): #shod_list is a list containing several strings
    q = pd.DataFrame()
    shod_l.append(q)

Answer 1

You can use list comprehension like this (since your assignment inside the loop has no effect):

shod_l = [pd.DataFrame() for _ in range(len(shod_list))]

Answer 2

All you need to do is:

shod_l = [pd.DataFrame() for _ in shod_list]

or if using a variable q :

shod_l = [pd.DataFrame() for q in shod_list]

or if you're determined to use a range:

shod_l = [pd.DataFrame() for q in range(len(shod_list))]

Answer 3

To answer the title question, yes, it's possible using assignment expressions . The equivalent loop would be

shod_l = [q := pd.DataFrame() for _ in range(len(shod_list))]

but as mentioned in the other answers, there's no point to binding q , so in this particular case, the assignment isn't needed.