Python looping statements differ from other programming languages

1. Local Variables

 for  in range (5):    print  i,print I,

Operation Result:

0 1 2 3 4 4

I is a local variable inside the for statement. In Python, however, within the same method, a local variable is defined, and the scope of the variable is defined as the beginning of the line to the end of the method body.

In other programming languages, the phrase "print I" is wrong, because I is not defined

Example 1:

def func ():     =    if a >        :=    Trueprint  bif__ name__'__main__':    func ()

Results:

True

Example 2:

def func ():     =    if a >        :=    Trueprint  bif__ name__'__main__':    func ()    print b

The last line is wrong because the B in the B,func () method is not defined as a local variable in the function body, so the "print B" inside the main is wrong.

2, Python for loop control statement

Example 1:

 for  in range (5):    A in range (6):         print  (i,j),     Print

Operation Result:

(0, 0) (0, 1) (0, 2) (0, 3) (0, 4) (0, 5)
(1, 0) (1, 1) (1, 2) (1, 3) (1, 4) (1, 5)
(2, 0) (2, 1) (2, 2) (2, 3) (2, 4) (2, 5)
(3, 0) (3, 1) (3, 2) (3, 3) (3, 4) (3, 5)
(4, 0) (4, 1) (4, 2) (4, 3) (4, 4) (4, 5)

Example 2:

Prime numbers between [50,100]

ImportMathcout=0 forIinchRange (50,100+1):     forJinchRange (2,int (math.sqrt (i)) +1):        ifI% J = =0: Break    Else:        PrintI, cout+=1ifcout% 10 = =0:cout=0Print        #Break #此处不能加break, otherwise the forbreak will be outside because the else at this level is side -by-side with the second for

Operation Result:

53 59 61 67 71 73 79 83 89 97

Analytical:

The For statement is a loop control statement in Python. Can be used to traverse an object and also has an optional else block, which is used primarily to handle the break statement contained in a for statement.

If the For loop is not terminated by a break, the statement in else is executed. For to terminate the For loop when needed.

The format for the For statement is as follows:

 for  in < objects collection >:    if < condition 1>:        break    if < Condition 2>:        Continue    < other statements >else:    <...>

Python looping statements differ from other programming languages