Python Learning Day2

 

4. Delete

 

5.keys.values.items

print(dict1.keys())
print(dict1.values())
print(dict1.items())

 

6. cycle

for key in dict1：
    print(key)

7.update()

print(dict1)
dict2={‘work':'student'}
#dict2加入dict1字典中
dict1.update(dict2)
print(dict1)

 

Tuple type (in parentheses, storing a plurality of values ​​separated by commas)

　

tuple1=(1,2,3)
print(tuple1)

1. In accordance with the index value

print(tuple1[2])

2. Section, care regardless tail

print(tuple1[0:6])
print(tuple1[0:6:2])

3. length

print (referred to as (tuple1))

4. Members and not in operation in

print(1 in tuple1)
print(1 not in tuple1)

5. cycle

for line in tuple1:
    print(line)

 

Collection Type

In the {}, separated by commas, can be stored a plurality of values, but to re-set the default function

set1={1，2，3，4，1，2，3，4}
print(set1)

Sets are unordered

set1=set()
set2={}
print(set1)
print(set2)
set2['name']='tank'
print(type(set2))