python输入_Python输入

python输入

In this tutorial we will learn about the most common function input() that we use frequently to take keyboard input from the user from the console. In our many tutorial we have used this, today we will see python input function more closely.

在本教程中，我们将学习最常用的函数input() ，我们经常使用它们从控制台获取用户的键盘输入。在我们的许多教程中，我们都使用了它，今天，我们将更加紧密地了解python输入函数。

Python input（） (Python input())

Python input function is present in the python builtins.py. It reads a string from standard input and the trailing newline is stripped.

Python输入函数位于python builtins.py 。它从标准输入中读取一个字符串，并删除尾随的换行符。

When the input() statement is executed then the program get paused until user gives the input and hit the enter key.

当执行input()语句时，程序将暂停，直到用户提供输入并按下Enter键。

input() returns the string that is given as user input without the trailing newline.

input()返回作为用户输入给出的字符串，不带尾随换行符。

Python获取用户输入 (Python get user input)

Let’s have a look at a simple example to get user input using python input function.

让我们看一个使用python输入函数获取用户输入的简单示例。

# taking an input from the keyboard
a = input()# taking another input from the keyboard
b = input()c = a + b
print("a + b = %s + %s = %s" % ( a, b, c ))

This will output:

这将输出：

45
12
a + b = 45 + 12  = 4512

Oops! What is the output? Addition of 45 and 12 is 4512 ?? It’s because the input() method returns String that is given from the keyboard input. To do what we really wanted to, we have to type cast it to integer as following:

糟糕！输出是什么？ 45和12的加法是4512 ?? 这是因为input（）方法返回从键盘输入中给出的String 。要执行我们真正想要的操作，我们必须将其类型转换为整数，如下所示：

c = int(a) + int(b)

Now it will output:

现在它将输出：

45
12
a + b = 45 + 12 = 57

So, after taking input, cast it as the way you want it.

因此，在接受输入后，将其转换为所需的方式。

带有String消息的Python输入函数 (Python input function with String message)

In the above example we don’t get any hint what we should do. To give users about the instructions, we can take input as following:

在上面的示例中，我们没有任何提示我们应该做什么。为了向用户提供这些说明，我们可以进行如下输入：

a = input('Please Enter the first number = ')
b = input('Enter the second number = ')
c = int(a) + int(b)
print("Summation of a + b = %s + %s = %s" % ( a, b, c ))

This will output:

这将输出：

Please Enter the first number = 45
Enter the second number = 12
Summation of a + b = 45 + 12 = 57

另一个简单的Python用户输入示例 (Another simple Python user input example)

The following example take the name of the user and finds out the number of occurrance of vowels in it.

下面的示例使用用户名，并找出其中的元音出现次数。

# taking input from prompt
name =input('what is your name? ')
print('Hello %s' % name)# taking a counter to count the vowels
count = 0
for i in name:i = i.capitalize()if i == 'A' or i == 'E' or i == 'I' or i == 'O' or i == 'U':count = count + 1print('Your name contains %s vowels' % count)

This will output:

这将输出：

Another thing that I should mention about the python input function is that it raises an error if the user hits EOF ( for *nix: Ctrl-D, Windows: Ctrl-Z+Return). The raised error is EOFError. In the above example if you press Ctrl-D then you will see the output as:

关于python input函数，我还应该提到的另一件事是，如果用户点击EOF（对于* nix：Ctrl-D，Windows：Ctrl-Z + Return），它将引发错误。引发的错误是EOFError 。在上面的示例中，如果您按Ctrl-D，则输出将显示为：

what is your name? ^D
Traceback (most recent call last):File "D:/T_Code/PythonPackage3/Input.py", line 2, in name =input('what is your name? ')
EOFError: EOF when reading a line

That’s all for a quick roundup on python input function and how to get user input in python.

这就是对python输入函数以及如何在python中获取用户输入的快速综述。

翻译自: https://www.journaldev.com/15815/python-input

python输入