python 示例

Python关键字除外 (Python except keyword)

except is a keyword (case-sensitive) in python, it is used with try... except statement to handle the exception.

除了是python中的一个关键字(区分大小写)，它与try ... except语句一起使用来处理异常。

except keyword defines a block which executes if statements are written in try block raise an error.

else关键字定义了一个块，如果在try块中编写了语句，该块将执行，并引发错误。

Note: We can define multiple blocks with except keyword to handle the different types of expectations by mentioning the error/exception names.

注意：我们可以通过提及错误/异常名称，使用except关键字定义多个块以处理不同类型的期望。

Syntax of except keyword

关键字除外的语法

    try:
statement(s)-1
except:
statement(s)-2

While executing the statement(s)-1, if there is any exception raises, control jumps to except block and statement(s)-2 executes.

在执行语句-1时 ，如果引发任何异常，则控制跳转到块和语句2 除外 。

Syntax of except keyword with multiple except blocks

具有多个except块的except关键字的语法

    try:
statement(s)-1
except Error_Name1:
statement(s)-A
except Error_Name2:
statement(s)-B
except Error_Name3:
statement(s)-C
..
except:
statement(s)-default

While executing the statement(s)-1 if Error_Name1 generates, statements written in Except Error_Name1 (statements(s)-A) executes, and so on... If any error is not mentioned with except block then last except block without any error name executes.

如果Error_Name1生成，则在执行语句-1时，将执行用Error_Name1 以外的语句编写的语句( 语句-A )，依此类推...如果未提及任何错误，则除了block 以外，最后一个exception 都没有错误名称执行。

Example:

例：

    Input:
a = 10
b = 0
try:
# no error
result = a%b
print(result)
except:
print("There is an error")
Output:
There is an error

Python的除外关键字示例 (Python examples of except keyword)

Example 1: Find modulus of two number and handle exception, if divisor is 0.

示例1：如果除数为0，则求两个数的模数并处理异常。

# python code to demonstrate example of
# except keyword
# Find modulus of two number and
# handle exception, if divisor is 0
a = 10
b = 3
try:
# no error
result = a%b
print(result)
# assign 0 to b
# an error will occur
b = 0
result = a%b
print(result)
except:
print("There is an error")

Output

输出量

1
There is an error

Example 2: Write an example to handle multiple errors.

示例2：编写示例以处理多个错误。

# python code to demonstrate example of
# except keyword
# Write an example to handle multiple errors
a = 10
b = 3
try:
# del b # uncomment this to test NameError
# no error
result = a%b
print(result)
# assign 0 to b
# an error will occur
b = 0
result = a%b
print(result)
except ZeroDivisionError:
print("Can not divide by 0")
except NameError:
print("A NameError in the code")
except:
print("There is an error")

Output

输出量

1
Can not divide by 0

翻译自: https://www.includehelp.com/python/except-keyword-with-example.aspx

python 示例