Unique Python loop statement _python

1. Local Variables

For I in range (5):
  print I,

print I,

Run Result:

0 1 2 3 4 4

I is the local variable inside the for statement. But inside Python, in the same method body, a local variable is defined, and the scope of the variable is to define the row to start at the end of the method body.

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

Example 1:

def func ():
  a = +
  if a >:
    b = True
  print b

if __name__ = = ' __main__ ':
  func ()

Results:

True

Example 2:

def func ():
  a = +
  if a >:
    b = True
  print b

if __name__ = = ' __main__ ':
  func ()
  PR int b

The last line is incorrect because there is no defined B,func () method where B is the local variable in the function body, so the "print B" inside main is incorrect.

2, Python for loop control statement

Example 1:

For I in range (5):
  for J in range (6):
    print (i,j),
  print

Run 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:

Ask for prime numbers between [50,100]

Import Math
cout = 0 for
i in range (50,100+1): for
  J in Range (2,int (math.sqrt (i)) +1):
    If I% j = = 0:
   break
  Else:
    print I,
    cout +=1
    if cout% = 0:
      cout = 0
      print
    #break # You cannot add a break here, otherwise you will be outside the forbreak because this level of else is side-by-side with the second for

Run Result:

53 59 61 67 71 73 79 83 89 97

Analytical:

The For statement is a circular control statement in Python. Can be used to traverse an object and have an optional else block, which is used primarily to process a for statement containing a break statement.

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

The For statement is formatted as follows:

For <> in < object set:
  if < condition 1>: Break
  If < condition 2>:
    continue
  < other statements >
else:
  <...>