Python_报错:SyntaxError: 'break' outside loopIndexError: list assignment index out of range(示例
Posted 翻滚的小强
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Python_报错:SyntaxError: 'break' outside loopIndexError: list assignment index out of range(示例相关的知识,希望对你有一定的参考价值。
今天发现一个报错,卡了好几个点,后来发现原因后,脸上三条黑线,尴尬啊!!!
报错:IndexError: list assignment index out of range
原因:split()写法转成列表就会认作一个整体,结果会是一个整体(示例:[\'gg111ggggggg222\']),不是预期结果
上源码:
def func(n,target_str):
with open("1003.txt","r+",encoding="utf-8") as fp:
word_str = fp.read()
print(word_str)
if n < len(word_str):
word_list = word_str.split()
word_list[n] = target_str
print(word_list)
else:
print("111")
调用该方法传入参数 func(2,"111")
报错了:
>>> func(2,"111")
gg111ggggggg222
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 7, in func
IndexError: list assignment index out of range
>>> def func(n,target_str): ... with open("1003.txt","r+",encoding="utf-8") as fp: ... word_str = fp.read() ... print(word_str) ... if n < len(word_str): ... word_list = word_str.split()#这里不能这么写啊,详见如下说明 ... word_list[n] = target_str ... print(word_list) ... else: ... print("111") ... >>> >>> func(2,"111") gg111ggggggg222 Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 7, in func IndexError: list assignment index out of range >>>
因为我源文件"1003.txt"的内容是:gg111ggggggg222
如果按上面的split()写法转成列表就会认作一个整体,结果会是[\'gg111ggggggg222\'],不是我要的结果
这里的 word_str的值是:gg111ggggggg222
word_list = word_str.split()#这里不能这么写
改成如下就好了:
word_list = list(word_str)#会将所有元素单独赋值给列表
精简下,就是如下意思:
str1 = "qwer"
list1 = str1.split()
list2 = list(str1)
print(list1)
print(list2)
>>> str1 = "qwer" >>> list1 = str1.split()#该场景下会作为整体转换为列表 >>> list2 = list(str1)#该场景下会将单个元素赋值给列表 >>> >>> >>> print(list1) [\'qwer\'] >>> print(list2) [\'q\', \'w\', \'e\', \'r\'] >>>
以上是关于Python_报错:SyntaxError: 'break' outside loopIndexError: list assignment index out of range(示例的主要内容,如果未能解决你的问题,请参考以下文章
Python_报错:SyntaxError: EOL while scanning string literal
Python解决程序运行报错:SyntaxError: non-default argument follows default argument
Python_报错:SyntaxError: 'break' outside loopIndexError: list assignment index out of range(示例
Python_报错:SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in posit
错误记录PyCharm 运行 Python 程序报错 ( SyntaxError: Non-ASCII character ‘xe5‘ in file x.py on line 1, but )(代码