Python Dictionary

A Dictionary is a unordered , indexed collection of items. Each item is given a Key and a value to store. For this example, the dictionary will store Users information such as Name, Date of Birth and phone number.

userDict = {
  "Name": "Joe",
  "DoB": "01/12/1901",
  "Phone": 8001234567
}
print(userDict)

Add Item

Items can be added by creating a new Key and giving it a value

userDict = {
  "Name": "Joe",
  "DoB": "01/12/1901",
  "Phone": 8001234567
}

userDict["Last Name"] = "Smith"

print(userDict)

Remove Item

pop.() can be used to remove specific items from a dictionary

userDict = {
  "Name": "Joe",
  "DoB": "01/12/1901",
  "Phone": 8001234567
}

userDict.pop("DoB")

print(userDict)

Edit Values

A Key’s values can be changed or edited by referencing it’s name

userDict = {
  "Name": "Joe",
  "DoB": "01/12/1901",
  "Phone": 8001234567
}
userDict["DoB"] = "03/07/2020"

print(userDict)

Retrieve Item

Objects in dictionary can be retrieved by using brackets and the name of the Key

userDict = {
  "Name": "Joe",
  "DoB": "01/12/1901",
  "Phone": 8001234567
}

user = userDict["Name"]

print(userDict)

Get Length of Dictionary

Print number of items in dictionary

print(len(userDict))

Loop Through Dictionary

This will loop through the dictionary one by one.

for x in thisdict:
  print(thisdict[x])

Loop through both Keys and Values

for x, y in thisdict.items():
  print(x, y)

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