详解Python中for循环的使用方法

for iterating_var in sequence:
  statements(s)

#!/usr/bin/python

for letter in 'Python':   # First Example
  print 'Current Letter :', letter

fruits = ['banana', 'apple', 'mango']
for fruit in fruits:    # Second Example
  print 'Current fruit :', fruit

print "Good bye!"

Current Letter : P
Current Letter : y
Current Letter : t
Current Letter : h
Current Letter : o
Current Letter : n
Current fruit : banana
Current fruit : apple
Current fruit : mango
Good bye!

#!/usr/bin/python

fruits = ['banana', 'apple', 'mango']
for index in range(len(fruits)):
  print 'Current fruit :', fruits[index]

print "Good bye!"

Current fruit : banana
Current fruit : apple
Current fruit : mango
Good bye!

#!/usr/bin/python

for num in range(10,20): #to iterate between 10 to 20
  for i in range(2,num): #to iterate on the factors of the number
   if num%i == 0:   #to determine the first factor
     j=num/i     #to calculate the second factor
     print '%d equals %d * %d' % (num,i,j)
     break #to move to the next number, the #first FOR
  else:         # else part of the loop
   print num, 'is a prime number'

10 equals 2 * 5
11 is a prime number
12 equals 2 * 6
13 is a prime number
14 equals 2 * 7
15 equals 3 * 5
16 equals 2 * 8
17 is a prime number
18 equals 2 * 9
19 is a prime number