趙婧伶python字典
w3schools截圖
w3schools練習程式碼
#趙婧伶 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"})
a.update({2303:"聯電"})
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
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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