PYTHON如何将字符串转换为int或float

Question

我尝试编写一个简单的计算器，但作为初学者，我不知道如何将输入字符串实际转换为 float 或 int。我希望输出在 2 时为整数，但不是 2.0，而在 float 时输出为 2.5。但我编码并输入 1 + 1 我仍然得到 2.0

from ast import literal_eval

# User input a simple calculation
num1, operator, num2 = input('Please enter a simple math calculation ').split()
num1 = float(num1)
num2 = float(num2)

# Convert string into either int or float
def convertString1 (num1):
    val = literal_eval(num1)
    return isinstance(val, int) or (isinstance(val, float) and val.is_integer())
def convertString2 (num2):
    val = literal_eval(num2)
    return isinstance(val, int) or (isinstance(val, float) and val.is_integer())


# Condition to perform calculation and output
if operator ==  "+" :
    print("{} + {} = {}".format(num1, num2, num1+num2))
elif operator == "-" :
    print("{} - {} = {}".format(num1, num2, num1-num2))
elif operator == "*" :
    print("{} * {} = {}".format(num1, num2, num1*num2))
elif operator == "/" :
    print("{} / {} = {}".format(num1, num2, num1/num2))
else :
    print("Syntax error")

Answer 1

最好加上if语句。例如

if int(res) == res:
    res = int(res)