控制流程之for循环

 names=['egon','asb','wsb','lsb','csb']

 n=0

 while n < len(names):

     print(names[n])

     n+=1

 names=['egon','asb','wsb','lsb','csb']

 info={'name':'egon','age':18,'sex':'male'}

 for k in info: #x=''age'

     print(k,info[k])

 for item in names:

     print(item)

 for i in range(1,10):

     print(i)

 for i in range(10): #默认的起始位置是0

     print(i)

 for i in range(1,10,2): #1 3  5  7  9

     print(i)

 names=['egon','asb','wsb','lsb','csb']

 for i in range(len(names)):

     print(i,names[i])

 for i in range(5):

     print('========>第一层: %s<=========' %i)

     for j in range(3):

         print('          第二层: %s' %j)

for+break

 names=['asb','wsb','egon','lsb','csb']

 for n in names:

     if n == 'egon':

         break

     print(n)

for+continue

 names=['asb','wsb','egon','lsb','csb']

 for n in names:

     if n == 'egon':

         continue

     print(n)

for+else

names=['asb','wsb','egon','lsb','csb']

for n in names:

    # if n == 'egon':

    #     break

    print(n)

else:

    print('=====>')