在python中将str转换为int和返回的最有效方法？

Question

这很有效，但我觉得为打印调用定义一个新变量效率不高。是否有更好的方法来获取输入并将其作为字符串打印。然后将它转换为int并可能再次返回到str？我读了％命令，但不相信我正确地加入了它。

if和block manuvering的数字测试。

print ('This is a program to choose two numbers adding up to ten')
firstInput = input(" Pick a number? ")
firstNumber = int (firstInput)

print ('Ok the base number is ' + firstInput + ' so make that 10')

newNumber = int(input(' Number to add? '))


if newNumber + firstNumber == 5 + 5:
    print ("That worked!")

if newNumber + firstNumber != 5 + 5:
    print ("That didn't work!")`

Answer 1

使用string formatting插入整数：

print('Ok the base number is {} so make that 10'.format(firstNumber))

您可以执行更复杂的格式化，但在此基本示例中，第一个插槽（{}）的值取自第一个参数（firstNumber），该参数自动转换为字符串使用str()内置函数。

作为一个完整的程序，只需要一些小的优化：

print ('This is a program to choose two numbers adding up to ten')
firstNumber = int(input(" Pick a number? "))

print('Ok the base number is {} so make that 10'.format(firstNumber))

newNumber = int(input(' Number to add? '))

if newNumber + firstNumber == 10:
    print("That worked!")
else:
    print("That didn't work!")`