帮助"def"在python3中**已解决** [英] Help with "def" in python3 **Solved**

问题描述

基本上我想发生的是用户输入一个数字，然后从所说的输入中减去一个数字.
解决方案1之后更新

我最初拥有的是

Basicly what i want to happen is the user inputs a number and one gets subtracted from said input.
updated after solution 1

What I originally had

b = input(int("pick a number")
def test(t):
	t-1
	return t
print(b test)

当我从终端运行它时，我得到:

When i run it from the terminal i get:

def test(t):
  ^
SyntaxError: invalid syntax

****************************************************** **********

我现在拥有的东西

************************************************************

What i have now

def test(t):
	return t-1
b = input("pick a number")
print (test(b))

但是我仍然出现错误

However i still get an error

Traceback (most recent call last):
  File "deftest2.py", line 5, in <module>
    b = input(int("pick a number"))
ValueError: invalid literal for int() with base 10: ''pick a number''
</module>

我尝试从输入中删除"int"，但是仍然出现错误.



谢谢您的时间.

I have tried taking out the "int" from input but i still get errors.



Thank you for your time.

推荐答案

这不是因为def引起的. def部分是正确的，除了一个错误:您不减去一个，因为相减的结果丢失了；您返回不变的t.

应该是:

This is not because of def. The def part is correct, except one bug: you don''t subtract one, because the result of subtraction is lost; you return unchanged t.

Should be:

def test(t):
    return t - 1

显示该错误是由于前一行，这简直是乱码.很难理解您想如何获得b.之所以显示def上的错误，是因为前一行的括号不平衡.

从上下文中可以猜到您想从用户输入中获取b.在这种情况下，您应该完成以下操作:

The error is shown due to the previous line, which is simply gibberish; hard to understand how did you want to get b. The error on def is shown because brackets on the previous line are not balanced.

From the context, one can guess that you wanted to get b from user''s input. In this case, you should have done:

def test(t):
    return t - 1

parameter = input("Input numeric parameter: ")
print test(parameter)

—SA

—SA

输入是字符串，因此您需要将其转换为int:

The input is a string, so that is what you need to convert to an int:

def test(t):
  return t-1

b = int(input("pick a number"))
print(test(b))

这篇关于帮助"def"在python3中**已解决**的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！