取字典info中值為10000的key值：

def getkeys(key):
    info = {"劉江紅": 12000, "曹俊傑": 10000, "趙磊": 10000}
    for i in info.keys():
        if info[i] == key:
            print(i)
getkeys(10000)

取字典info中值大於10010的key值：

def getkeys(v):
    info = {"劉江紅": 12000, "曹俊傑": 11000, "趙磊": 10000}
    info["李俊"] = 10000
    for i,key in info.items():
        if info[i] == key and key > v:
            print(i)
getkeys(10010)

Phthon函數之一——取字典中的條件key