#   some basic tuple examples.
l = (10,20,30)
m = (30,20,10)

print(f"l: {l}")
print(f"m: {m}")
print(f"m[0]: {m[0]}")
print(f"m[1]: {m[1]}")
print(f"m[2]: {m[2]}")
print(f"l==m: {l==m}")
print(f"l==[10,20,30]: {l==[10,20,30]}")

# no need to know for the moment: lexicographical comparison on lists.
print(f"l>m: {l>m}")
print(f"m>l: {m>l}")

"""  Methods changing lists do not exist for tuples. E.g.,
# append: add to the end.
print(l.append(20)
l.append(30)
l.append(20))
l.append(20)
l.append(30)
l.append(20)
"""

print(f"l: {l}")
print(f"len(l): {len(l)}")
print(f"l.count(20): {l.count(20)}")

print(f"l+m:{l+m}")

p = (1, 'hello', 1.89e40, (3+10, 'world'))

print(f"p: {p}")
print(f"p[0]: {p[0]}")
print(f"p[1]: {p[1]}")
print(f"p[2]: {p[2]}")
print(f"p[3]: {p[3]}")
print(f"p[3][0]: {p[3][0]}")
print(f"p[3][1]: {p[3][1]}")


q = (10,20,30)
print("tuples are immutable")
print(f"q: {q}")
print(f"id(q): {id(q)}")

print(
"""ql = list(q)
ql.reverse()
ql.append(90)
q = tuple(ql)""")
print("If really, really need to change a tuple, convert it to a list.")
ql = list(q)
ql.reverse()
ql.append(90)
q = tuple(ql)
print(f"q: {q}")
print(f"id(q): {id(q)}")