Example summary of the dictionary dict common operation methods in python

This example summarizes the common operations of dictionary dict in python. Share with you for your reference. The details are as follows:

The python code below shows the common operations of dictionaries in python. Dictionaries play an important role in the development of python

# Create an empty dictionary 
x = {}
# Create a dictionary with three items 
x = {"one":1, "two":2, "three":3}
# Access one of these elements 
x['two']
# Returns a list of all keys in the dictionary 
x.keys()
# Returns a list of all values in the dictionary 
x.values()
# Add a new project 
x["four"]=4
# Modify a dictionary project 
x["one"] = "uno"
# Delete a dictionary item 
del x["four"]
# Copy a dictionary to the new variable 
y = x.copy()
# Clear all dictionary items 
x.clear()
# Returns the dictionary length and number of items 
z = len(x)
# Detects whether the dictionary contains the specified key
z = x.has_key("one")
# Go through the dictionary key
for item in x.keys(): print item
# Traverses the list of values in the dictionary 
for item in x.values(): print item
# use if Statement gets the corresponding key value in the dictionary 
if "one" in x:
  print x['one']
if "two" not in x:
  print "Two not found"
if "three" in x:
  del x['three']

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