Line to record

Write the codeEasy 2 stages

The parser from "Skip blanks and comments" prints each reading and forgets it. The rest of the ground software needs the readings themselves: the alert check, the charts, the daily report. Each one should be able to ask a reading for its sensor or its value by name.

Store every reading as a record, then use the records to answer an engineer's question.

Instead of printing each reading, store it as a dict in a list called records, then print how many there are and each record:

Records: 4
{'time': '09:30:05', 'sensor': 'ENG-2', 'value': 412.5, 'unit': 'C'}
{'time': '09:30:05', 'sensor': 'TANK-1', 'value': 78.3, 'unit': '%'}
{'time': '09:30:10', 'sensor': 'CABIN', 'value': 101.2, 'unit': 'kPa'}
{'time': '09:30:10', 'sensor': 'ENG-2', 'value': 415.0, 'unit': 'C'}

Start with records = []. In the loop, build {"time": timestamp[11:19], "sensor": sensor, "value": float(value), "unit": unit} and append it. The value is a number in the record, so it prints without quotes.

Store the records

Records the rest of the program can use

Finish stage 1 to unlock this stage.

An engineer wants the ENG-2 readings. Add wanted = "ENG-2" under the feed, keep the count line, and instead of printing every record, print only the records of the wanted sensor. If there are none, say so:

Records: 4
ENG-2 at 09:30:05: 412.5 C
ENG-2 at 09:30:10: 415.0 C

With wanted = "GYRO-X", the last line is No readings from GYRO-X.

Read each record by key: record["sensor"], record["time"] and so on. Inside an f-string, use the other kind of quotes: {record['time']}.

Pick out one sensor

Works for any sensor

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Hints

Creating Dictionaries

creating-dictionaries-python.py

# A dictionary stores pairs: a key, then its value
webb = {
    "name": "James Webb Space Telescope",
    "mirror_metres": 6.5,
    "launched": 2021,
    "instruments": 4,
    "infrared": True,
}
print(webb)

# Square brackets look up a value by its key
print("Mirror width:", webb["mirror_metres"], "metres")

# get() returns a fallback instead of crashing on a missing key
print("Cost:", webb.get("cost", "not recorded"))

# The dict() function builds the same thing from keyword arguments
hubble = dict(name="Hubble", mirror_metres=2.4, launched=1990)
print("Hubble mirror:", hubble["mirror_metres"], "metres")

# Keys do not have to be text. Anything unchangeable works
launch_log = {
    1990: "Hubble",
    2021: "Webb",
    (2027, "planned"): "Roman",
}
print(launch_log[1990])
print("Missions logged:", len(launch_log))
print("Anything launched in 2021?", 2021 in launch_log)

Open the full example

script.py

PythonLn 1, Col 1Spaces: 4

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Command-line arguments (sys.argv)

Separate arguments with commas. They're passed on every Run as sys.argv[1:].