Python 3 Style Checker for beginners

Blank lines should not contain any tabs or spaces.

Line is missing whitespace around an operator.

Line is longer than 79 characters.

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

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

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

The first line in docstrings should end with a period.

Line contains whitespace after the final character.

The first line in docstrings should read like a command.

This function should have a docstring.

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

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

Line is indented less than it should be.

Too many blank lines.

Files should end with a newline.

Line contains tabs when only spaces are expected.

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

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

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

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

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

The first word in the first line should be capitalised.

Function docstrings should not have blank lines after them.

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

Line has too many indentation levels.

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

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

Text in docstrings should not be surrounded by whitespace.

Methods should have docstrings.

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

Functions and classes should have two blank lines after them.

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

Program failed to compile.

Variables in functions should be lowercase.

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

The __init__ method should have a docstring.

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

Line contains multiple statements.

Class docstrings should have 1 blank line after them.

Line is indented more than it should be.

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

Class should have a docstring.

Docstring is over-indented.

<> has been removed in Python 3.

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

Line is indented when it shouldn't be.

Line is not indented at the correct level.

Line is indented using a mixture of spaces and tabs.

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

Function names should be lowercase.

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

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

Mixed case variable used in the global scope

Function docstrings should not have blank lines before them.

Line has multiple spaces after an operator.

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

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

Line is not indented at the correct level.

Line is indented when it shouldn't be.

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

Line contains multiple statements.

Argument names should be lowercase.

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

Line ends in a semicolon (;).

Line contains more than one space after a keyword.

Class names should use the CapWords convention.

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.

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

Line contains a tab character before a keyword.

Change outer quotes to avoid escaping inner quotes.

Docstring is under-indented.

Class docstrings should not have blank lines before them.

Nested definitions should have one blank line before them.

Line is not aligned correctly for a hanging indent.

Line has multiple spaces before an operator.

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

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

Line contains more than one space before a keyword.

Comments should only start with a single # character.

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

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

Magic methods should have docstrings.

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

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

Sections in docstrings must have content.

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

Line has the same indentation as the next logical line.

Mixed case variable used in the class scope

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

Line contains imports from different modules on the same line.

Line contains a function named l, O, or I

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

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 camelCase has been imported as lowercase.

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

Using raise ExceptionType, message is not supported.

Backticks have been removed in Python 3.

async and await are reserved names

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.

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 u""" for docstrings that contain Unicode.

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 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 is missing a space after a keyword.

Line contains a blank line after a function decorator.

Line contains multiple statements.

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

The first argument of a classmethod should be named cls.

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 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.