trying to do simple loop and insert 0 if condition is true, but it not working.
could you please help me to solve this simple issue
Thank you
a_list = [1,2,3]
num = 0
for i in a_list:
if len(str(i)) < 2 :
a_list.insert(i,num)
print(a_list)
a_list must be [01,02,03]
You are missing indentation, it should be like this :
a_list = [1,2,3]
num = 0
for i in a_list:
if len(str(i)) < 2:
a_list.insert(i,num)
print(a_list)
and you are doing wrong in your logic, you should replace and not insert element, you should have something like this :
a_list = [1,2,3]
num = 0
for i,e in enumerate(a_list):
if len(str(e)) < 2:
a_list[i]='0'+str(e);
print(a_list)
You got it wrong. When you insert into a list, you add an item to a specific position (0 in your case). The output you want is manipulating the currect data, i.e change 1 -> 01, 2 -> 02. It's not as same as [0, 1].
a_list = [1,2,3]
num = 0
for idx, i in enumerate(a_list):
if len(str(i)) < 2:
a_list[idx] = '{:0>2}'.format(i)
print(a_list) # --> ['01', '02', '03']
