key_value_learning

# author: Roy.G
info={"1":"a",
      "2":"b",
    "3":"c",
    "4":"d",
    "5":"e",
}
print(info)
print(info["1"])
info["1"]="wusong"
print(info["1"])
info["7"]="luzhishen"
print(info)
del info["2"]
print(info)
info.pop("1")  #delete info["1"]
print(info)

info={"1":"a",  # remake info for next leaning
      "2":"b",
    "3":"c",
    "4":"d",
    "5":"e",
}
print("1" in info)  #determin if "1" in info