拜访字典中的项
能够应用 [key] 的形式来拜访字典中的项，比方获取上面字典中的 key=model 的值，代码如下：
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964}x = thisdict["model"]print(x)PS E:\dream\markdown\python> & "C:/Program Files (x86)/Python/python.exe" e:/dream/markdown/python/app/app.pyMustang当然除了中括号，还能够应用 get() 办法来拜访，如下代码所示:
x = thisdict.get("model")获取字典中的所有 keys
要想获取字典中的所有 keys，能够间接调用 dict 的 keys() 办法即可。
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964}keys = thisdict.keys()print(keys)PS E:\dream\markdown\python> & "C:/Program Files (x86)/Python/python.exe" e:/dream/markdown/python/app/app.pydict_keys(['brand', 'model', 'year'])获取字典中的所有 values
除了能够获取 dict 中的 keys，还能够通过 values() 获取 dict 中的所有value，如下代码所示：
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964}keys = thisdict.values()print(keys)PS E:\dream\markdown\python> & "C:/Program Files (x86)/Python/python.exe" e:/dream/markdown/python/app/app.pydict_values(['Ford', 'Mustang', 1964])获取字典中的每一项
下面的办法别离从 dict 中获取 keys 或者 values,这一节咱们调用 items() 获取字典中的 key-value 汇合，如下代码所示:
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964}items= thisdict.items()print(items)PS E:\dream\markdown\python> & "C:/Program Files (x86)/Python/python.exe" e:/dream/markdown/python/app/app.pydict_items([('brand', 'Ford'), ('model', 'Mustang'), ('year', 1964)])查看字典中是否存在指定key
要想判断字典中是否存在某一个 key，能够用 python 内置的 in 操作符即可，如下代码所示：
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964}if "model" in thisdict: print("Yes, 'model' is one of the keys in the thisdict dictionary")PS E:\dream\markdown\python> & "C:/Program Files (x86)/Python/python.exe" e:/dream/markdown/python/app/app.pyYes, 'model' is one of the keys in the thisdict dictionary译文链接：https://www.w3schools.com/pyt...