Progress on one line
When the ground station uploads a flight plan to Python One, the console first shows what it's doing and then, once it's finished, how it went. Command-line tools do this all the time: you see Uploading flight plan... while you wait, and done appears on the same line when it's over.
The catch is that every print() ends with a new line, so two prints give two lines. Change how they end.
Finish stage 1 to unlock this stage.
The two prints show up on two lines. In a real upload, the first one appears right away and the second only when the upload has finished, so keep them as two separate prints. Make them share one line:
Uploading flight plan... done
Give the first print() the argument end=" ": it then ends with a space instead of a new line.
Finish stage 1 to unlock this stage.
The full upload has three steps, and each prints its result when it finishes. Put every step and its result on one line:
Uploading flight plan... done Verifying checksum... OK Activating plan... done
Only the prints that show a step need end=" ". The results keep their normal ending, which starts the next line.
Finish stage 2 to unlock this stage.
While the link comes up, the ground station prints a dot every second, on the same line as the message that says what it's waiting for. Then the result goes on a new line:
Waiting for ground station... Link established
This time the dots touch the text, with no spaces, so use end="". Think about which print has to finish the line.
Hints
Print Parameters sep and end
# Parameter sep changes the separator between items
print("Mercury", "Venus", "Earth", "Mars")
print("Mercury", "Venus", "Earth", "Mars", sep=" -> ")
print("Mercury", "Venus", "Earth", "Mars", sep="\n")
# Parameter end changes what appears at the end of print
print()
print("Countdown:", end=" ")
print("3", end="... ")
print("2", end="... ")
print("1", end="... ")
print("LAUNCH!")
Separate arguments with commas. They're passed on every Run as sys.argv[1:].