fix(guide): simplify directory structure

guide/english/python/return-statement/index.md

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+---
+title: Python Return Statement
+---
+<a href='https://docs.python.org/3/reference/simple_stmts.html#the-return-statement' target='_blank' rel='nofollow'>Python Docs</a>
+
+All functions return a value when called.
+
+If a return statement is followed by an expression list, that expression list is evaluated and the value is returned:
+
+    >>> def greater_than_1(n):
+    ...     return n > 1
+    ...
+    >>> print(greater_than_1(1))
+    False
+    >>> print(greater_than_1(2))
+    True
+
+If no expression list is specified, `None` is returned:
+
+    >>> def no_expression_list():
+    ...     return    # No return expression list.
+    ...
+    >>> print(no_expression_list())
+    None
+
+If a return statement is reached during the execution of a function, the current function call is left at that point:
+
+    >>> def return_middle():
+    ...     a = 1
+    ...     return a
+    ...     a = 2     # This assignment is never reached.
+    ...
+    >>> print(return_middle())
+    1
+
+If there is no return statement the function returns None when it reaches the end:
+
+    >>> def no_return():
+    ...     pass     # No return statement.
+    ...
+    >>> print(no_return())
+    None
+     
+ A single function can have multiple `return` statements.  Execution of the function ends when one of these `return` statements is reached:
+ 
+     >>> def multiple_returns(n):
+     ...    if(n):
+     ...        return "First Return Statement"
+     ...    else:
+     ...        return "Second Return Statement"
+     ...
+     >>> print(multiple_returns(True))
+     First Return Statement
+     >>> print(multiple_returns(False))
+     Second Return Statement
+     
+ A single function can return various types:
+ 
+     >>> def various_return_types(n):
+     ...     if(n==1):
+     ...         return "Hello World."   # Return a string
+     ...     elif(n==2):
+     ...         return 42               # Return a value
+     ...     else:
+     ...         return True             # Return a boolean
+     ... 
+     >>> print(various_return_types(1))
+     Hello World.
+     >>> print(various_return_types(2))
+     42
+     >>> print(various_return_types(3))
+     True
+ 
+ It is even possible to have a single function return multiple values with only a single return:
+ 
+     >>> def return_two_values():
+     ...     a = 40
+     ...     b = 2
+     ...     return a,b
+     ...
+     >>> print("First value = %d,  Second value = %d" %(return_two_values()))
+     First value = 40,  Second value = 2