Python range function to resolve differences and enumerate

This article describes the Python range function parses the difference enumerate, the paper sample code described in great detail, has a certain reference value of learning for all of us to learn or work, a friend in need can refer to
enumerate more than the range in iteration flexible, generally try to use erumerate, exemplified below:

First look at the range of use

city_list = ['beijing', 'shanghai', 'tianjing', 'wuhan']
 
# 用range将元素打印出来
# 直接打印，不用range
for city in city_list:
  print('this is %s' % city)
 
# 用下标打印
for i in range(len(city_list)):
  city = city_list[i]
  print('this is %s' % city)
# 以字典的方式打印
for i in range(len(city_list)):
  city = city_list[i]
  print('%s： %s' %(i+1,city)

Print Results:

this is beijing
this is shanghai
this is tianjing
this is wuhan
this is beijing
this is shanghai
this is tianjing
this is wuhan
1： beijing
2： shanghai
3： tianjing
4： wuhan

Look at the usage enumera:

for i,city in enumerate(city_list):
  print('%s： %s' %(i+1,city))
# 也可以直接指定开始计数的值
for i,city in enumerate(city_list,7):
  print('%s： %s' %(i,city))

The results are as follows:

1： beijing
2： shanghai
3： tianjing
4： wuhan
7： beijing
8： shanghai
9： tianjing
10： wuhan

In summary:

enumer function more concise wording, the index can be assigned to each element in the iteration
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