自學python

http://www.pythonlearn.com/html-270/

assignment:

A statement that assigns a value to a variable.

concatenate:

To join two operands end to end.

comment:

Information in a program that is meant for other programmers (or anyone reading the source code) and has no effect on the execution of the program.

evaluate:

To simplify an expression by performing the operations in order to yield a single value.

expression:

A combination of variables, operators, and values that represents a single result value.

floating point:

A type that represents numbers with fractional parts.

floor division:

The operation that divides two numbers and chops off the fractional part.

integer:

A type that represents whole numbers.

keyword:

A reserved word that is used by the compiler to parse a program; you cannot use keywords like if, def, and while as variable names.

mnemonic:

A memory aid. We often give variables mnemonic names to help us remember what is stored in the variable.

modulus operator:

An operator, denoted with a percent sign (%), that works on integers and yields the remainder when one number is divided by another.

operand:

One of the values on which an operator operates.

operator:

A special symbol that represents a simple computation like addition, multiplication, or string concatenation.

rules of precedence:

The set of rules governing the order in which expressions involving multiple operators and operands are evaluated.

statement:

A section of code that represents a command or action. So far, the statements we have seen are assignments and print statements.

string:

A type that represents sequences of characters.

type:

A category of values. The types we have seen so far are integers (type int), floating-point numbers (type float), and strings (type str).

value:

One of the basic units of data, like a number or string, that a program manipulates.

variable:

A name that refers to a value..




Python reserves 31 keywords¹ for its use:

and       del       from      not       while    
as        elif      global    or        with     
assert    else      if        pass      yield    
break     except    import    print              
class     exec      in        raise              
continue  finally   is        return             
def       for       lambda    try