陳瑀晞python字典dictionaries

w3schools截圖

w3schools程式碼

#陳瑀晞 字典 keys:value

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("廻圏列出字典的所有值")

for t in a:

  print(a[t])

b= a.copy() #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.pop(2881)  #移除

print("移除後的字典")

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{...}縮排整齊整齊

   i = i + 1

   print("台灣第" + str(i) + a[t])

w3schools字典方法列表

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

Method	Description
clear()	移除字典內容Removes all the elements from the dictionary
copy()	拷貝Returns a copy of the dictionary
fromkeys()	Returns a dictionary with the specified keys and value
get()	取得鍵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

opacity 0.1

opacity 0.3

opacity 0.6