students = [('john', 'A', 20), ('mary', 'B', 30), ('jack','C', 60)]
students = sorted(students,key=lambda x:x[0])
print(students)
students = sorted(students,key=lambda x:x[1])
print(students)
students = sorted(students,key=lambda x:x[2])
print(students)
students = sorted(students,key=lambda x:x[2],reverse=True)
print(students)
# Output:
# [('jack', 'C', 60), ('john', 'A', 20), ('mary', 'B', 30)]
# [('john', 'A', 20), ('mary', 'B', 30), ('jack', 'C', 60)]
# [('john', 'A', 20), ('mary', 'B', 30), ('jack', 'C', 60)]
# [('jack', 'C', 60), ('mary', 'B', 30), ('john', 'A', 20)]
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