Unsupported operand error for datetime values-CodePudding

I am getting the following error when running the code below:

prev_suffix = ('_'   current_year   '_q'   str(int(current_quarter) - 2))
      8 elif cq == '1':
----> 9     prev_suffix = ('_'   current_year -1   '_q'   str(int(current_quarter)   2))

TypeError: unsupported operand type(s) for -: 'str' and 'int'

Not entirely sure why this is not working

x = datetime.datetime.now()
current_year = str(x.year)[2:]
current_quarter = str(((x.month-1)//3) 1)
current_suffix = ('_'   current_year   '_q'   current_quarter)

if current_quarter == '3':
        prev_suffix = ('_'   current_year   '_q'   str(int(current_quarter) - 2))
elif cq == '1':
    prev_suffix = ('_'   current_year -1   '_q'   str(int(current_quarter)   2))

CodePudding user response：

It is because of

current_year -1

It should be

str(int(current_year) - 1))

This being the final version:

x = datetime.datetime.now()

current_year = str(x.year)[2:]
current_quarter = str(((x.month-1)//3) 1)
current_suffix = ('_'   current_year   '_q'   current_quarter)

if current_quarter == '3':
        prev_suffix = ('_'   current_year   '_q'   str(int(current_quarter) - 2))
elif current_quarter == '1':
    print(type(current_year), type(current_quarter))
    prev_suffix = ('_'   str(int(current_year) - 1)   '_q'   str(int(current_quarter)   2))

CodePudding user response：

Because in line prev_suffix = ('_' current_year '_q' str(int(current_quarter) - 2))

You try to add and subtract from string

current_year type is a string and you try to subtract 1 from current_year -1

You can do this like this

str(int(current_year) -1)