Python 字典提供了一些常用的方法,如keys()、values()、items()等,用来获取字典中的所有键、所有值、所有键值对等,例如: ```python my_dict = {"name": "Alice", "age": 30, "city": "New York"} print(my_dict.keys()) # 输出 dict_keys(['name', 'age', 'city']) print(my_dict.values(...
keys = ['a','b','c'] dict_1 = dict.fromkeys(keys) print(dict_1) # {'a': None, 'b': None, 'c': None} # 也可以创建的时候传入一个值value,但是没意义,因为这个value是所有key都一样的 values = [1,2,3] dict_1 = dict.fromkeys(keys,values) # 注意不会将value分配到对应的key ...
result=[]forkey,valueindictionary.items():result.append((key,value))foriteminresult:print(item[0],item[1]) 1. 2. 3. 4. 5. 6. 5. 示例运行 让我们通过一个示例来运行上述代码,以便更好地理解纵向打印字典的过程。 dictionary={'name':'John','age':25,'city':'New York'}result=[]forkey...
Print thekey-valuepairs– To print the keys & values both, loop through the dictionary and use theitems()method, it returns the key-value pair. Syntax: for key,value in dictionary_name.items(): print(key, value) Python program to create a dictionary with integer keys, an...
def to_dictionary(keys,values):returndict(zip(keys,values))keys= ["a","b","c"]values= [2,3,4]print(to_dictionary(keys,values))#{'a': 2, 'c': 4, 'b': 3} 21 使用枚举 我们常用 For 循环来遍历某个列表,同样我们也能枚举列表的索引与值。
#!/usr/bin/python tinydict = {'Name': 'Runoob', 'Age': 27} print ("Age : ", tinydict.get('Age')) # 没有设置 Sex,也没有设置默认的值,输出 None print ("Sex : ", tinydict.get('Sex')) # 没有设置 Salary,输出默认的值 0.0 print ('Salary: ', tinydict.get('Salary', 0.0...
enumerate是Python的内置函数,用于将一个可遍历的数据对象(如列表、元组或字符串)组合为一个索引序列,同时列出数据和数据下标。 names = ['Alice', 'Bob', 'Charlie'] for index, name in enumerate(names, start=1): print(index, name) 4. 字典推导式(Dictionary Comprehensions) ...
在Python中,可以使用print语句来打印字典中的特定项。要仅返回换行符,可以按照以下步骤操作: 创建一个字典,包含需要打印的项。例如:my_dict = {'item1': 'value1', 'item2': 'value2', 'item3': 'value3'} 使用print语句和字典的键来打印特定项。在这种情况下,我们想要打印换行符,可以使用\n来表...
Python example to print the key value of a dictionary. stocks = {'IBM':146.48,'MSFT':44.11,'CSCO':25.54}print(stocks)fork, vinstocks.items():print(k, v)forkinstocks:print(k, stocks[k]) Output {'IBM': 146.48,'MSFT': 44.11,'CSCO': 25.54} ...
Iterating over keys to print a dictionary line by line in Python. This is a more unconventional method as compared to the one mentioned above, as it involves two separate operations which need to be understood and implemented. In this way, we iterate over each key one by one, and post ...