在Pycharm波浪线经常出现在编译程序中。当你不知道有什么问题时，你可以把鼠标移到波浪线上，查看提示信息，然后在下面PEP在代码规范问题上寻找解决方案 
解决方案:代码末尾需要另一行，光标可以移到最后回车
解决方法：缩进不是4倍，检查缩进
解决方法：过度缩进，检查缩进
解决方法:逗号后面空格少，加空格就行了，类似分号或者冒号后面空格少。
解决方法：不要说一句话 import 以中引用多个库为例：import socket, urllib.error最好写成：import socket import urllib.error
解决方案：代码末尾有更多的空格，可以删除空格
解决方案：代码和注释之间至少有两个空间
解决方案：注释应从#添加空间开始
解决方案：注释应从#添加空间开始
解决方法：import不在文件的顶部，以前可能还有其他代码
解决方案:需要两条空白线，加两条空白线
解决方法：将函数名改为小写
解决方法：操作符(‘操作符’=’、’>’、’<前后缺少空间，可以加上
解决方法:关键字/参数等号周围出现意外空格，可以去除空格
解决方法：一行写多行语句，如：if x == 2: print(‘OK分两行写
解决方案:超过每行最大长度限制79
可简化连锁比较(如:if a >= 0 and a <= 9: 可简写为：if 0 <= a <= 9:）
若要选择性地忽略PEP8代码风格的警告信息可采用以下方法：（养成良好习惯，编写标准代码！不建议忽略！
①将鼠标移到有警告信息的地方，按下 alt Enter，选择忽略（Ignore）这个错误可以：
②依次选择 File - Settings - Editor - Inspections，在 Python下找到 PEP8 coding style violation 选项，在右下角 Ignore errors 点击加号添加需要忽略的警告信息ID（ID信息见附录)，比如想忽略indentation contains mixed spaces and tabs这个警告只需要添加ID：E101 即可
code sample message E1 Indentation E101 indentation contains mixed spaces and tabs E111 indentation is not a multiple of four E112 expected an indented block E113 unexpected indentation E114 indentation is not a multiple of four (comment) E115 expected an indented block (comment) E116 unexpected indentation (comment) E117 over-indented E121 (^) continuation line under-indented for hanging indent E122 (^) continuation line missing indentation or outdented E123 () closing bracket does not match indentation of opening bracket’s line E124 (^) closing bracket does not match visual indentation E125 (^) continuation line with same indent as next logical line E126 (^) continuation line over-indented for hanging indent E127 (^) continuation line over-indented for visual indent E128 (^) continuation line under-indented for visual indent E129 (^) visually indented line with same indent as next logical line E131 (^) continuation line unaligned for hanging indent E133 () closing bracket is missing indentation E2 Whitespace E201 whitespace after ‘(‘ E202 whitespace before ‘)’ E203 whitespace before ‘:’ E211 whitespace before ‘(‘ E221 multiple spaces before operator E222 multiple spaces after operator E223 tab before operator E224 tab after operator E225 missing whitespace around operator E226 () missing whitespace around arithmetic operator E227 missing whitespace around bitwise or shift operator E228 missing whitespace around modulo operator E231 missing whitespace after ‘,’, ‘;’, or ‘:’ E241 () multiple spaces after ‘,’ E242 () tab after ‘,’ E251 unexpected spaces around keyword / parameter equals E261 at least two spaces before inline comment E262 inline comment should start with ‘# ‘ E265 block comment should start with ‘# ‘ E266 too many leading ‘#’ for block comment E271 multiple spaces after keyword E272 multiple spaces before keyword E273 tab after keyword E274 tab before keyword E275 missing whitespace after keyword E3 Blan line E301 expected 1 blank line, found 0 E302 expected 2 blank lines, found 0 E303 too many blank lines (3) E304 blank lines found after function decorator E305 expected 2 blank lines after end of function or class E306 expected 1 blank line before a nested definition E4 Import E401 multiple imports on one line E402 module level import not at top of file E5 Line length E501 (^) line too long (82 > 79 characters) E502 the backslash is redundant between brackets E7 Statement E701 multiple statements on one line (colon) E702 multiple statements on one line (semicolon) E703 statement ends with a semicolon E704 () multiple statements on one line (def) E711 (^) comparison to None should be ‘if cond is None:’ E712 (^) comparison to True should be ‘if cond is True:’ or ‘if cond:’ E713 test for membership should be ‘not in’ E714 test for object identity should be ‘is not’ E721 (^) do not compare types, use ‘isinstance()’ E722 do not use bare except, specify exception instead E731 do not assign a lambda expression, use a def E741 do not use variables named ‘l’, ‘O’, or ‘I’ E742 do not define classes named ‘l’, ‘O’, or ‘I’ E743 do not define functions named ‘l’, ‘O’, or ‘I’ E9 Runtime E901 SyntaxError or IndentationError E902 IOError W1 Indentation warning W191 indentation contains tabs W2 Whitespace warning W291 trailing whitespace W292 no newline at end of file W293 blank line contains whitespace W3 Blank line warning W391 blank line at end of file W5 Line break warning W503 () line break before binary operator W504 () line break after binary operator W505 (*^) doc line too long (82 > 79 characters) W6 Deprecation warning W601 .has_key() is deprecated, use ‘in’ W602 deprecated form of raising exception W603 ‘<>’ is deprecated, use ‘!=’ W604 backticks are deprecated, use ‘repr()’ W605 invalid escape sequence ‘x’ W606 ‘async’ and ‘await’ are reserved keywords starting with Python 3.7