Learn Python by doing

results = []
for number in [3, 5]:
    results.append(number * 3)
print(results)

Options: [9, 15] · [3, 5, 3, 5, 3, 5] · [3, 15]

Answer: [9, 15]

number is first 3, then 5. Python multiplies each integer and appends 9, then 15.

reading = "15"
print(reading + "5")

Options: 20 · 155 · TypeError

Answer: 155

Both values are strings, so + joins them into 155. It does not add them numerically.

def double(number):
    return number * 2

Options: print(double) · print(double(6)) · double = 12

Answer: print(double(6))

double(6) calls the function with number = 6. print displays its returned value, 12.

def is_low(reading, threshold):
    return int(reading) < threshold

Options: is_low("25", "30") · is_low("25", 30) · is_low(30, "25")

Answer: is_low("25", 30)

The first argument may be numeric text because int() converts it. The second must already be a number for this implementation.

def battery_label(battery):
    return "Low" if battery < 20 else "OK"

message = battery_label(10)
print(message)

Options: True · 10 · "Low"

Answer: "Low"

The function returns the string Low. message stores that returned string, and print displays it.

device = {"name": "Kitchen", "battery": 10}
results = []
results.append(device)
print(results)

Options: ["Kitchen", 10] · [{"name": "Kitchen", "battery": 10}] · [10]

Answer: [{"name": "Kitchen", "battery": 10}]

results contains one item: the complete device dictionary.

device = {
    "name": "Kitchen sensor",
    "online": False,
    "last_battery": 5,
}
if not device["online"] and device["last_battery"] < 20:
    print("Check battery; low last-known reading")

Options: Battery definitely dead; restart every integration · Possible low battery; check the device · Device is working normally

Answer: Possible low battery; check the device

Offline state plus a low last-known reading supports checking the battery. It does not establish a certain cause. You have completed the guided trail; use the practice campfire to build and test your own report.

reading = "15"
print(int(reading) + 5)

Options: An error is thrown · 10 · undefined · 20

Answer: 20

It prints: 20. "15" is text. int() turns it into a number you can add.