何建誠python字典

w3schools截圖

程式碼

a ={ #台灣股票市場價值最大,何建誠python
  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

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

Method方法	Description說明
clear()	移除字典的Removes all the elements項目(items) 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

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