蔡耀葳python字典Dictionary

w3schoolS截圖

w3schools程式碼

#蔡耀葳 字典 keys:value a = { "2330": "台積電", "2317": "鴻海", "2454": "聯發科", "2412": "中華電" } print(a) print("用迴圈印出所有值") for t in a: print(a[t] +" 用get()方法 " + a.get(t)) a.update({1108:"幸福"}) print(a) a.popitem() print(a) a.update({6505:"台塑化"}) a.update({2308:"台達電"}) print(a.keys()) print("練習values方法") print(a.values()) print("練習items方法") print(a.items())

w3schools字典方法列表

Python has a set of built-in methods that you can use on dictionaries.

Method	Description說明方法
clear()	移除字典內容   Removes all the elements from the dictionary
copy()	Returns a copy of the dictionary
fromkeys()	Returns a dictionary with the specified keys and value
get()	Returns the value of the specified key
items()	Returns a list containing a tuple for each key value pair
keys()	Returns a list containing the dictionary's keys
pop()	移除某個項目Removes the element with the specified key
popitem()	移除最後一個Removes the last inserted key-value pair
setdefault()	Returns the value of the specified key. If the key does not exist: insert the key, with the specified value
update()	加入新項目Updates the dictionary with the specified key-value pairs
values()	Returns a list of all the values in the dictionary