Python 3 Style Checker for beginners

Line is longer than 79 characters.

Line contains spaces before or after the = in a function definition.

Line is missing whitespace around one of the following characters: , ; and :.

Line contains whitespace after the final character.

Blank lines should not contain any tabs or spaces.

Line has an indentation level that is not a multiple of four.

Comments should start with a # character and have one space between the # character and the comment itself.

This function should have a docstring.

Line is missing whitespace around an operator.

Line contains an inline comment that does not have 2 spaces before it.

The first line in docstrings should end with a period.

Line contains a {character} that has a space before it.

Line is indented less than it should be.

Two blank lines are expected before and after each function or class.

The first line in docstrings should read like a command.

Comments have a space between the # character and the comment message.

Too many blank lines.

Module (the term for the Python file) should have a docstring.

There should be 1 blank line between the summary line and the description.

Files should end with a newline.

Line contains a {character} that has a space before it.

Functions and classes should have two blank lines after them.

The first word in the first line should be capitalised.

Use """triple double quotes""" around docstrings.

Variables in functions should be lowercase.

There are either zero, two, or more than two blank lines at the end of your file.

Line contains tabs when only spaces are expected.

Line contains a {character} that has a space before it.

Line has too many indentation levels.

Function docstrings should not have blank lines after them.

Text in docstrings should not be surrounded by whitespace.

Methods should have docstrings.

Comparisons to objects such as True, False, and None should use is or is not instead of == and !=.

Backslash is used to escape a character that cannot be escaped.

Line has an indentation level that is not a multiple of four.

Line is missing a blank line between the methods of a class.

Program failed to compile.

Function names should be lowercase.

Except block is calling all exceptions, instead it should catch a specific exception.

Docstrings that are longer than one line should have closing quotes on a separate line.

Line has multiple spaces after an operator.

Line is not indented at the correct level.

Docstrings that are one line long should fit on one line with quotes.

Class should have a docstring.

The __init__ method should have a docstring.

Line contains multiple statements.

Line is not indented at the correct level.

Line is indented more than it should be.

Argument names should be lowercase.

Docstring is over-indented.

Module imports should be at the top of the file and there should be no statements in between module level imports.

Line contains a {character} that has a space after it.

Mixed case variable used in the global scope

Function docstrings should not have blank lines before them.

Class docstrings should have 1 blank line after them.

Line is not indented as far as it should be or is indented too far.

Line contains more than one space after a keyword.

Class names should use the CapWords convention.

Line is indented when it shouldn't be.

Line is indented when it shouldn't be.

Line ends in a semicolon (;).

Change outer quotes to avoid escaping inner quotes.

Line has a closing bracket that does not match the indentation of the opening bracket.

There is no need for a backslash (\) between brackets.

Nested definitions should have one blank line before them.

Comments should only start with a single # character.

Line contains more than one space before a keyword.

Line has multiple spaces before an operator.

Line is indented using a mixture of spaces and tabs.

There should be no blank lines between a section header and its content.

Line is missing whitespace around a modulo operator (%).

Line assigns a lambda expression instead of defining it as a function using def.

Line uses one of the variables named l, O, or I

Line has the same indentation as the next logical line.

Mixed case variable used in the class scope

Comparisons to objects such as True, False, and None should use is or is not instead of == and !=.

Import that should have been imported as lowercase has been imported as non lowercase

Magic methods should have docstrings.

Class docstrings should not have blank lines before them.

Sections in docstrings must have content.

Line has a continuation that should be indented one extra level so that it can be distinguished from the next logical line.

Line is missing whitespace around a bitwise or shift operator (<<, >>, &, |, ^).

Packages should have docstrings.

Public nested classes should have docstrings.

Class docstrings should have 1 blank line before them.

Docstrings should be indented using spaces, not tabs.

Docstring is under-indented.

Docstrings that are more than one line long should start at the first line.

Docstrings that are more than one line long should start at the second line.

Section is indented by too many levels.

Section underline is indented by too many levels.

Use r""" if there are any backslashes in a docstring.

Use u""" for docstrings that contain Unicode.

The first line in docstrings should not be a copy of the function’s definition.

First word of the docstring should not be 'This'.

Section name should be properly capitalised.

Section names should end with a newline.

Section names should have a dashed line underneath them.

Dashed line should be on the line following the section's name.

Dashed section underline should match the length of the section's name.

Section should have a blank line after it.

Section should have a blank line before it.

The last section in a docstring should have a blank line after it.

The first line in your docstring should end with a period, question mark, or exclamation point.

Section names should end with a colon.

Docstrings should include argument descriptions.

Line is less indented than it should be.

Line has a closing bracket that does not match the indentation level of the line that the opening bracket started on.

Line is indented more than it should be.

Line is not aligned correctly for a hanging indent.

Line contains a tab character before an operator.

Line contains a tab character after an operator.

Line is missing whitespace around an arithmetic operator (+, -, / and *).

Line has multiple spaces after the , character.

Line contains a tab character after the , character.

Line contains a tab character after a keyword.

Line contains a tab character before a keyword.

Line is missing a space after a keyword.

Line contains a blank line after a function decorator.

Line contains imports from different modules on the same line.

Line contains multiple statements.

Line contains multiple statements.

When testing whether or not something is in an object use the form x not in the_object instead of not x in the_object.

When testing for object identity use the form x is not None rather than not x is None.

You should compare an objects type by using isinstance() instead of ==. This is because isinstance can handle subclasses as well.

Line contains a class named l, O, or I

Line contains a function named l, O, or I

The first argument of a classmethod should be named cls.

The first argument of a method should be named self.

Function names should not start and end with __ (double underscore).

Import that should have been imported as a constant has been imported as a non constant.

Import that should have been imported as camelCase has been imported as lowercase.

Import that should have been imported as camelCase has been imported as a constant.

Import that should have been imported as camelCase has been imported as an acronym.

Use single quotes (') instead of double quotes (").

Use single quotes (') instead of double quotes (") in multiline strings.

Use single quotes (') instead of double quotes (") in docstrings.

Line break is before a binary operator.

Line break is after a binary operator.

Line is longer than 79 characters.

.has_key() was deprecated in Python 2. It is recommended to use the in operator instead.

Using raise ExceptionType, message is not supported.

<> has been removed in Python 3.

Backticks have been removed in Python 3.

async and await are reserved names