w3scholls截圖
w3scholls練習程式碼
#字典 keys:values, 廖思涵
#w3schools原來 字串:字串,改成 整數:字串
a = { #市場價值最大的五家公司
2330: "台積電",
2317: "鴻海",
2454: "聯發科",
2412: "中華電",
6505: "台塑化"
}
print(a)
print(a[6505])
print(a.get(2330))#功能同 a[2330]
print(a.keys()) #keys()方法列出key搜尋鍵
print(a.values()) #keys()方法列出values值
b = a.copy()
print("列出b " + str(b))
print(b[2317])
print(b.clear())
a.update({2308: "台達電"})
print(a.values())
print("用迴圈列出字典a的所有值")
for t in a:
print(a[t])
字典方法Dictionary Methods
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
|
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