楊朝淞w3schools字典方法

w3schools截圖

w3schools程式碼

# 楊朝淞 字典 keys : value市場價格最大的公司 a = { 2330: "台積電", 2317: "鴻海", 2454: "聯發科", 2412: "中華電", 6505: "台塑化",2308: "台達電", } print(a) print("迴圈列出字典的所有值") for t in a: print(a[t]) b= a.coply() #字典不能直接assign print(b) a.update({2881:"富邦金控"})#台灣第七大 a.update({2303:"聯電"}) #台灣第八大 for t in a: print(a[t]) a.setdefault(1303,"南亞") a.setdefault(2882,"國泰金") i = 0 for t in a: #python迴圈不使用{...}縮排整齊 i = i + i print("台灣第"+ str(i) + a[t])

w3schools字典方法列表

<h1>w3schools截圖</h1>

<h1>w3schools程式碼</h1>

<h1>w3schools字典方法列表</h1>

a

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

Method	Description
clear()	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()	Removes the element with the specified key
popitem()	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()	Updates the dictionary with the specified key-value pairs
values()	Returns a list of all the values in the dictionary