0%

Python程序运行常见错误总结

Python程序运行常见错误总结

1.SyntaxError:invalid syntax

语法错误:非法的语法。这种错误很常见,根据系统提示好好检查代码即可,看报错信息在第几行,从这一行往上找错误。

错误例子:

>>> if i=3:   

SyntaxError: invalid syntax

2.NameError: name ‘q’ is not defined

变量名错误:’q’未定义。解决方法是在前面给q赋值,还有一种可能是变量或者函数名拼写错误。

错误例子:

>>> q

Traceback (most recent call last):

 File "<pyshell#0>", line 1, in <module>

  q

NameError: name 'q' is not defined

3.Indentation Error

缩进错误:Python的缩进非常严格,行首多个空格,少个空格都会报错。 像def,class,if,for,while等代码块都需要缩进。

错误例子:

i=2

j=3

if i<j:

print(i)

IndentationError: expected an indented block

4.IndexError: string index out of range

索引错误:字符串超出了范围。解决办法:查看字符串的长度,索引要小于长度。

错误例子:

>>> s='hello'

>>> s[6]

Traceback (most recent call last):

 File "<pyshell#8>", line 1, in <module>

  s[6]

IndexError: string index out of range

5.ValueError: substring not found

值错误:子字符串未找到。

错误例子:

>>> s1='hello'

>>> s2='ei'

>>> s1.index(s2)

Traceback (most recent call last):

 File "<pyshell#11>", line 1, in <module>

  s1.index(s2)

ValueError: substring not found

6.IndexError: list index out of range

索引错误:列表索引超出范围。解决办法:查看列表的长度,索引要小于长度。

错误例子:

>>> L=[1,2,3]

>>> L[4]

Traceback (most recent call last):

 File "<pyshell#5>", line 1, in <module>

  L[4]

IndexError: list index out of range

7.AttributeError: ‘tuple’ object has no attribute ‘remove’

属性错误:元组对象没有属性’remove’。

错误例子:

>>> t=('a','b','c')

>>> t.remove('a')

Traceback (most recent call last):

 File "<pyshell#13>", line 1, in <module>

  t.remove('a')

AttributeError: 'tuple' object has no attribute 'remove'

8.KeyError: ‘ff’

key 键错误:没有指定的键值“ff”

错误例子:

>>> dict={'a':1,'b':2,'c':3}

\>>> dict['ff']

Traceback (most recent call last):

 File "<pyshell#3>", line 1, in <module>

  dict['ff']

KeyError: 'ff'

9.TypeError: pop expected at least 1 arguments, got 0

类型错误:pop方法希望得到至少一个参数,但是现在参数为0。

错误例子:

>>> dict={'a':1,'b':2,'c':3}

>>> dict.pop()

Traceback (most recent call last):

 File "<pyshell#7>", line 1, in <module>

  dict.pop()

TypeError: pop expected at least 1 arguments, got 0

10.TypeError: Can’t convert ‘int’ object to str implicitl

类型错误:不能转换整形成字符串。解决办法:使用+拼接时必须使用字符串,或将数字转化成字符串str()

错误例子:

>>> 'hello'+9

Traceback (most recent call last):

 File "<pyshell#9>", line 1, in <module>

  'hello'+9

TypeError: Can't convert 'int' object to str implicitly

11. SyntaxError: EOL while scanning string literal

语法错误:在字符串首尾忘记加引号。

错误例子:

>>> print('hello)    

SyntaxError: EOL while scanning string literal

12. TypeError: 'range' object does not support item assignment

类型错误:range不支持item操作。range() 返回的是“range object”,而不是实际的 list 值。

错误例子:

>>> l=range(10)

>>> l[3]=16

Traceback (most recent call last):

 File "<pyshell#8>", line 1, in <module>

  l[3]=16

TypeError: 'range' object does not support item assignment

可改为:

>>> l=list(range(10))

>>> l[3]=16

13. IndentationError:unindent does not match any outer indentation level

缩进错误:未知缩进不匹配任何缩进等级。缩进混乱造成。

错误例子:

>>> if i==1:

​   j=2

​    k=3    

SyntaxError: unindent does not match any outer indentation level

14. FileNotFoundError: [Errno 2] No such file or directory: ‘file1’

文件不存在:尝试打开一个不存在的磁盘文件或目录。

错误例子:

>>> f=open('file1')

Traceback (most recent call last):

 File "<pyshell#15>", line 1, in <module>

  f=open('file1')

FileNotFoundError: [Errno 2] No such file or directory: 'file1'
制作不易,如若感觉写的不错,欢迎打赏