Python error in list output due to integer error-CodePudding

Thanks to those who give me a solution earlier on. However i need to utilise the split function for the solution as its part of the requirement stated. When i run this code, there is an error

TypeError Traceback (most recent call last) in 7 8 for x in dob_list: ----> 9 age =[year-int(x.split("-")[-1:])] 10 print(age)

TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'

dob_list = ['01-Jan-1990', '11-Aug-1995', '15-Apr-1982', '20-Mar-1988', '25-Nov-1976', '07-Dec-1965', 
            '18-Dec-1977', '25-May-1994', '09-Oct-1981', '19-Feb-1981']


year = 2021
age =[]

dob = []

for x in dob_list:
    age  =[year-int(x.split("-")[-1:])]

print(age)

CodePudding user response：

x.split("-")[-1:] actually gives you a list which contains only the last list item, since you are using a range (like [-1:]) instead of a number (like [-1]).

x.split("-")[-1]gives you the last list item (from x.split("-")) as a string.

CodePudding user response：

The number one debug tool in python is print. A line is failing? Print the stuff on the line before to see what you get.

dob_list = ['01-Jan-1990', '11-Aug-1995', '15-Apr-1982', '20-Mar-1988', '25-Nov-1976', '07-Dec-1965', 
            '18-Dec-1977', '25-May-1994', '09-Oct-1981', '19-Feb-1981']


year = 2021
age =[]

dob = []

for x in dob_list:
    print("next value", repr(x.split("-")[-1:]))
    age  =[year-int(x.split("-")[-1:])]

Running, I get

$ python3 test.py
next value ['1990']
Traceback (most recent call last):
  File "/home/td/tmp/j/i.py", line 12, in <module>
    age  =[year-int(x.split("-")[-1:])]
TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'

That traceback is useful. I see the failing line and it tells me int() doesn't like lists. Looking backwards... yep, that was a list being passed in. Just get the final value instead.

age  =[year-int(x.split("-")[-1])]