1.遍历和判断字典
dict6 = {'name': 'Tom', 'age': 18, 'love': 'python'}
# 获取和遍历键
keys = dict6.keys()
for k in keys:
print(k)
# 获取和遍历键值对
its = dict6.items()
for k, v in its:
print(k, v)
2.字典的计算和判定
# 计算
print(len(dict6))
# 判定（in 和 not in）,只能判定键
print('name' in dict6)
print('name' not in dict6)