数据类型

for num in nums:
    print(num)

for idx, val in enumerate(nums):
    print(idx, val)

import copy
a = [1, 2, 3, 4, ['a', 'b']] #原始对象
 
b = a                     #赋值，传对象的引用
c = copy.copy(a)          #对象拷贝，浅拷贝
d = copy.deepcopy(a)      #对象拷贝，深拷贝
 
a.append(5)               #修改对象a
a[4].append('c')          #修改对象a中的['a', 'b']数组对象
 
print( 'a = ', a )
print( 'b = ', b )
print( 'c = ', c )
print( 'd = ', d )

>>> ('a = ', [1, 2, 3, 4, ['a', 'b', 'c'], 5])
>>> ('b = ', [1, 2, 3, 4, ['a', 'b', 'c'], 5])
>>> ('c = ', [1, 2, 3, 4, ['a', 'b', 'c']])
>>> ('d = ', [1, 2, 3, 4, ['a', 'b']])

# define user = dict()
user = {
    'userName': 'MatNoble',
    'gender': 'Male',
    'age': 18,
}

# .items()
for key, value in user.items():
    print(f"\nKey:{key}")
    print(f"Value:{value}")

# .key() + .get(key)
for key in user.keys():
    print(key + ":" + str(user.get(key)))

# .values()
for value in user.values():
    print(value)