Dictionaries: What Does This Print

What does this print? · Intermediate · about 8 min

Read each short program and type exactly what it prints, with each printed line on its own line. If a program stops with an error, type the error's name, like TypeError.

Example

d = {"cat": 2}
d["dog"] = 3
print(d["cat"], len(d))

prints

2 2

Program 1

d = {"a": 1, "b": 2, "a": 3}
print(d, len(d))

What it prints

Program 2

d = {"x": 1}
print(d.get("y"), d.get("y", 0))

What it prints

Program 3
```
d = {"x": 1}
print(d["y"])
```
What it prints

Program 4

d = {"apple": 3}
print(3 in d, "apple" in d)

What it prints

Program 5

counts = {}
for ch in "hello":
    counts[ch] = counts.get(ch, 0) + 1
print(counts["l"], len(counts))

What it prints

Program 6

d = {"a": 1, "b": 2}
for k in d:
    print(k, d[k] * 10)

What it prints

Program 7

d = {"a": 1, "b": 2}
v = d.pop("a")
print(v, d)

What it prints

Program 8

d = {"a": 1}
d.setdefault("a", 9)
d.setdefault("b", 7)
print(d)

What it prints