Python基础之字典的详细使用教程

# author: 爪哇斗罗(javaDouLuo)
# date: 2022/7/11 22:51
 
# 字典的创建
dict01={"A": 1, "B": 2, "C": 3}
# {'A': 1, 'B': 2, 'C': 3}
print(dict01)
dict02=dict(a=1, b=2,name="zs")
# {'a': 1, 'b': 2, 'name': 'zs'}
print(dict02)

# author: 爪哇斗罗(javaDouLuo)
# date: 2022/7/11 22:51
 
# 字典的创建
dict01 = {"A": 1, "B": 2, "C": 3}
 
# 字典的元素获取
# 1
print(dict01["A"])
# 3
print(dict01.get("C"))
# KeyError: 'D'
# print(dict01["D"])

# author: 爪哇斗罗(javaDouLuo)
# date: 2022/7/11 22:51
 
# 字典的创建
dict01 = {"A": 1, "B": 2, "C": 3}
 
# True
print("A" in dict01)
# False
print("A" not in dict01)
 
# 删除 B
del dict01["B"]
# {'A': 1, 'C': 3}
print(dict01)
# 增加元素 D
dict01["D"]=4
# {'A': 1, 'C': 3, 'D': 4}
print(dict01)
# 修改D的值
dict01["D"]=40
# {'A': 1, 'C': 3, 'D': 40}
print(dict01)

# author: 爪哇斗罗(javaDouLuo)
# date: 2022/7/11 22:51
 
# 字典的创建
dict01 = {"A": 1, "B": 2, "C": 3}
 
# 获取所有的key
keys = dict01.keys()
# 类型为 <class 'dict_keys'>
print(type(keys))
# dict_keys(['A', 'B', 'C'])
print(keys)
# 转化为列表 ['A', 'B', 'C']
print(list(keys))
 
# 获取所有的value
values = dict01.values()
# 类型为 <class 'dict_values'>
print(type(values))
# dict_values([1, 2, 3])
print(values)
# 转化为列表 [1, 2, 3]
print(list(values))
 
# 获取所有的键值对
items = dict01.items()
# <class 'dict_items'>
print(type(items))
# dict_items([('A', 1), ('B', 2), ('C', 3)])
print(items)
# 元组的数据结构 [('A', 1), ('B', 2), ('C', 3)]
print(list(items))

# author: 爪哇斗罗(javaDouLuo)
# date: 2022/7/11 22:51
 
# 字典的创建
dict01 = {"A": 1, "B": 2, "C": 3}
 
# A 1 1
# B 2 2
# C 3 3
for item in dict01:
    print(item,dict01[item],dict01.get(item))