Some commonly used key words

• and: a calculation expression indicating a logical AND operation
• as: the type of conversion
• assert: whether to assert or variable for determining the value of the conditional expression is true
• break: the loop terminates task
• class: class is used to define
• continue: skip this cycle, the next cycle continues
• def: a function or method used to define the
• del: delete a variable or a sequence of values
• elif: conditional statements, in conjunction with else
• else: conditional statements, and if used in conjunction with elif. Or an abnormality may also be cyclic
• except: code comprising capturing operation exception, in combination with the try and finally
• for: loop
• finally: After the statement for an exception, an exception, always execute the code block finally contained. And try. except in combination
• from: import module for use in conjunction with import
• global: define global variables
• if: conditional statements, and else. elif used in combination
• import: import module for, in combination with from
• is: determining whether a variable is an instance of a class
• lambda: anonymous function definitions
• nonlocal: a variable for identifying external scope
• not: for arithmetic expressions, logical negation operation
• or: arithmetic expression for representing the logical operations or
• pass: empty class, function, method placeholder
• raise: exception is thrown operation.
• return: the calculation result for the function returns
• try: include statements may appear abnormal, and except, finally used in combination
• while: loop
• with: python simplified statement
• yield: return value from the function for sequentially