str() 在我的函数体中不起作用

Question

I am trying to write a simple function where I need to concatenate a string and an integer converted into a string. My code is as follows:

def bonus_time(salary, bonus):
    total_Salary = 0

    if bonus == True:
        total_Salary = salary * 10
    else:
        total_Salary = salary

    print(total_Salary)    
    str(total_Salary)        
    return "$" + total_Salary

print(bonus_time(1000, True))

The error I get is that python cannot concatenate string and int, even though I am using str() to convert the int to a string.

Many thanks for any help.

Answer 1

You do not reassign the converted value. Simply change your return statement to

return "$" + str(total_Salary)

and omit the previous call to str(). Additionally, total_Salary = 0 has no influence as you're changing the variable afterwards.

---

Summing up, you could write:

def bonus_time(salary, bonus):
    total_Salary = salary * 10 if bonus else salary
    return "${}".format(total_Salary)

Or - even shorter, using the ternary operator:

 def bonus_time(salary, bonus): total_Salary = salary * 10 if bonus else salary return "${}".format(total_Salary)

I'd argue though that your first if/else expression is more readable and should be used instead.

Answer 2

replace :

str(total_Salary)

return "$" + total_Salary

with

return "$" + str(total_Salary)