python 常见报错集锦

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#
1.未定义:NameError: name 'a' is not defined
print(a)

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---------------------------------------------------------------------------
NameError
Traceback (most recent call last)
<ipython-input-1-70ed2873a890> in <module>
1 #
1.未定义
----> 2 print(a)
NameError: name 'a' is not defined

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#
2.类型不一致:TypeError: must(必须) be(是) str, not(不) int
b = 'name'
c = 123
b+c

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---------------------------------------------------------------------------
TypeError
Traceback (most recent call last)
<ipython-input-2-1b1b33123c88> in <module>
2 b = 'name'
3 c = 123
----> 4 b+c
TypeError: must be str, not int

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#
TypeError: unsupported operand type(s) for +: 'int' and 'str'
c+b

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---------------------------------------------------------------------------
TypeError
Traceback (most recent call last)
<ipython-input-3-baf87dc38fa6> in <module>
----> 1 c+b
TypeError: unsupported operand type(s) for +: 'int' and 'str'

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#
ValueError: invalid literal for int() with base 10: 'name'
c+int(b)

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---------------------------------------------------------------------------
ValueError
Traceback (most recent call last)
<ipython-input-4-362903aa1601> in <module>
----> 1 c+int(b)
ValueError: invalid literal for int() with base 10: 'name'

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#
语法错误:SyntaxError: invalid(无效的) character(字符) in(在) identifier(标识符)
print（123）

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File "<ipython-input-6-94af2698dffa>", line 2
print（123）
^
SyntaxError: invalid character in identifier

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#
漏符号:SyntaxError: invalid(无效的) syntax(语法)
if 3>2
print(666)

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File "<ipython-input-7-75cad109330d>", line 2
if 3>2
^
SyntaxError: invalid syntax

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#
太多符号导致遗漏:SyntaxError: unexpected EOF while parsing
int(int(eval('123'))

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File "<ipython-input-8-11fff21863fc>", line 2
int(int(eval('123'))
^
SyntaxError: unexpected EOF while parsing

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#
4.缩进错误:IndentationError: unexpected(意想不到的) indent(缩进)
if 2>1:
print(2)
print(3)

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File "<ipython-input-9-43763d7ec7c2>", line 4
print(3)
^
IndentationError: unexpected indent

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#
5.索引错误:IndexError: list index out of range(范围)
list = [1,2,3]
print(list[3])

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---------------------------------------------------------------------------
IndexError
Traceback (most recent call last)
<ipython-input-10-16cd916f6e29> in <module>
1 #
5.索引错误
2 list = [1,2,3]
----> 3 print(list[3])
IndexError: list index out of range

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#
6.NoteType错误,一般发生在连写的时候
dict2 = {'a':'12345','B':'45678'}
dict2.get('a')[-1]
dict2.get('b')[-1]

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---------------------------------------------------------------------------
TypeError
Traceback (most recent call last)
<ipython-input-12-d6fb3babac46> in <module>
2 dict2 = {'a':'12345','B':'45678'}
3 dict2.get('a')[-1]
----> 4 dict2.get('b')[-1]
TypeError: 'NoneType' object is not subscriptable

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dict2 = {'a':'12345','B':'45678'}
print(dict2.get('b').find_all('img'))

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---------------------------------------------------------------------------
AttributeError
Traceback (most recent call last)
<ipython-input-13-2df3f5fc235b> in <module>
1 dict2 = {'a':'12345','B':'45678'}
----> 2 print(dict2.get('b').find_all('img'))
AttributeError: 'NoneType' object has no attribute 'find_all'