A summary of common operation methods in Python dictionary dict _python

The example of this article summarizes the common operation methods of Dict dictionary in Python. Share to everyone for your reference. Specifically as follows:

The following Python code shows the common operation of the dictionary in Python, the dictionary plays a pivotal role in Python development, and mastering the dictionary operation is very important

#创建一空字典
x = {}
#创建包含三个项目的字典
x = {"One": 1, "two": 2, "three": 3}
#访问其中的一个元素
x[' two ']
# Returns the list of all the keys in the dictionary
X.keys ()
#返回字典中的所有值列表
x.values ()
#添加一个新的项目
x["Four"]=4
#修改一个字典项目
x ["one"] = "Uno"
#删除一个字典项目
del x["four"]
#复制一个字典到新的变量
y = x.copy ()
#清除所有字典项目
x.clear ()
#返回字典长度, number of items
z = Len (x)
#检测字典是否包含了指定的key
z = X.has_key ("one") #遍历字典中的key for
item in X.keys (): Print item
#遍历字典中的值列表 for
item in X.values (): Print item
#使用if语句获取字典中相应的键值
if ' one ' in x:< C30/>print x[' one ']
if "two" not in X:
  print "Two not found"
if "three" in X:
  del x[' three ']

I hope this article will help you with your Python programming.