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Filter the log

Write the codeMedium 2 stages

The full mission log has every heater adjustment and wheel-speed check in it. The flight director's screen shows only the entries that need attention: warnings and errors.

Build that filtered list from the log, then make the filter adjustable, as real logging tools do.

Build a new list called alerts with only the WARN and ERROR entries, in log order. Then print how many there are, and each one:

Alerts: 4
[T+00:12:05] WARN  Battery 3 temperature high
[T+00:14:47] ERROR Fuel valve 2 not responding
[T+00:15:42] WARN  Star tracker lost lock
[T+00:16:03] ERROR Fuel valve 2 still closed

Start with alerts = [], loop over the log, and append() each line that contains "] WARN" or "] ERROR". The log itself must stay complete.

Filter the log
A new list, the log untouched

Finish stage 1 to unlock this stage.

Make the filter adjustable. Add the two lines below under the log, then keep every entry whose level is min_level or more serious, and use min_level in the first line of the output:

LEVELS = ["INFO", "WARN", "ERROR"]    # from least to most serious
min_level = "WARN"                    # show this level and above
WARN and above: 4
[T+00:12:05] WARN  Battery 3 temperature high
[T+00:14:47] ERROR Fuel valve 2 not responding
[T+00:15:42] WARN  Star tracker lost lock
[T+00:16:03] ERROR Fuel valve 2 still closed

The level is the second word of each entry: line.split()[1]. LEVELS.index(level) gives its rank, 0 for INFO up to 2 for ERROR, so compare the ranks.

Filter by level
Works for any level
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Hints

For Loop Basics

for-loop-basics.py
# A for loop visits every item in a collection, one at a time
cargo = ["water", "food", "spare parts", "experiments"]

for item in cargo:
    print("Loading:", item)

print("Hold sealed")

# The loop body can do real work, not just print
masses_kg = [820, 640, 310, 175]
total = 0
for mass in masses_kg:
    total = total + mass
print("Total cargo:", total, "kg")

# A tuple of pairs unpacks straight into two variables
manifest = (("water", 820), ("food", 640), ("experiments", 175))
for name, mass in manifest:
    print(f"{name}: {mass} kg")

# A string is a collection too, one character at a time
for letter in "CYGNUS":
    print(letter, end=" ")
print()

# A set works as well, but the order is never promised
for module in {"Unity", "Harmony", "Destiny"}:
    print("Docking check:", module)
Open the full example
script.py
PythonLn 1, Col 1Spaces: 4
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Separate arguments with commas. They're passed on every Run as sys.argv[1:].