'2'
'11'
'234'
'1234'
'12345'
'2'
'11'
'234'
'1234'
'12345'
2’
0000
‘
‘00011’
‘00234’
‘01234’
‘12345’
'00002'
'00011'
'00234'
'01234'
'12345'
x
np.char.zfill(x, 5)
One digit
Two digit
Three digit
Added zeros on left
Numeric string of 5 digits with zeros:
Four digit
Five digit
w3resource.com