Important terms in Python

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Statement

A statement is an instruction that the Python interpreter can execute.

•       When you type a statement on the command line, Python executes it and displays the result, if there is one.

•        A script usually contains a sequence of statements. If there is more than one statement, the results appear one at a time as the statements execute.

•       An expression is a combination of values, variables, and operators.

•       If you type an expression on the command line, the interpreter evaluates it and displays the result:

•       >>> 1 + 1

•       2

•       A value all by itself is considered an expression, and so is a variable.

Simultaneous Assignment:

•       Python also supports simultaneous assignments like this:

•           var1,var2…………..,varn=exp1,exp2…………….,expn

•       >>> a,b,c=4,5,6

•       >>> a

•       4

•       >>> b

•       5

•       >>> c

•       6

Example of simultaneous assignment:

Write code to swap two numbers.

>>>X=1                                                               

>>>Y=3

>>>Temp=X

>>>X=Y

>>>Y=Temp

Can be written as:

>>>X=1                                                               

>>>Y=3

>>>X,Y=Y,X