What if you have more than two possibilities? Use elif (short for "else if"):
score = 85
if score >= 90:
grade = "A"
elif score >= 80:
grade = "B"
elif score >= 70:
grade = "C"
else:
grade = "F"
Python checks conditions top to bottom. The first True condition's block runs, then the rest are skipped. If none match, the else block runs.
You can have as many elif clauses as you need. The else at the end is optional but recommended as a catch-all.