This Python Dictionary Methods lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
get, keys, values, items, update, pop, and setdefault are the methods you need first.
setdefault returns the current value, or stores the default and returns that.
Example 1: Start here
A second setdefault for the same key does not overwrite the city.
learner = {"name": "Meera"} # a dictionary; each key has one value
print(learner.setdefault("city", "Chennai"))
print(learner)
Example 2: Store the idea in a name
Python Dictionary Methods begins with a value you can point at. The name topic holds that text.
topic = "Python Dictionary Methods" # text
print(topic)
Example 3: Check it with if
An if chooses one branch. Change the score and run it again to see the other message.
score = 8 # a whole number
if score >= 80: # run the indented lines only when this is true
print("Pass")
else: # runs when the test above was false
print("Try again")
Example 4: Repeat with a loop
A for loop runs the indented line once per step. The numbers 1, 2, and 3 are printed on their own lines.
for step in range(1, 4): # repeat once per number; range stops before the last
print("Step", step) # a comma prints each value, with a space between
A second setdefault for the same key does not overwrite the city.
