[learn Python from simple to deep] built in sequence functions: enumerate, zip, and reversed

L1=['10','20','abc','Python']
print(L1)

[‘10’, ‘20’, ‘abc’, ‘Python’]

enumerate

#enumerate
for i,value in enumerate(L1):
print(i,value)

0 10
1 20
2 abc
3 Python

zip

#zip
L1=['name','age','city']
L2=['zhangsan',30,'Beijing']
list(zip(L1,L2))# take L1 and L2 Pairing ,List Convert to list 

[(‘name’, ‘zhangsan’), (‘age’, 30), (‘city’, ‘Beijing’)]

reverse

# Normal order 
for i in range(10):
print(i)

0
1
2
3
4
5
6
7
8
9

#reverse Reverse order display 
for i in reversed(range(10)):
print(i)

9
8
7
6
5
4
3
2
1
0