Can somebody please explain what is happening here?

Question

t=10,20,30
for i in range (len(t)):
print(t[i]) #output is 10,20,30
#But if I type
print(t[i-1]) #output is 30,10,20
print(t[i-2]) # output 20,30,10
#if I type
print(t[i in range(0,1)] #output is 20,10,10

Answer 1

Check out again.. Are you missed anything in question?

t=10,20,30 #makes a tuple

for i in range (len(t)):
print(t[i]) #output is 10,20,30

print(t[i-1]) #output is 20 , here temparary variable i has remains and retaining its value i=2, so i-1 index refers value 20 in t.

print(t[i-2]) # output 10, similar way, i-2=0, t[0]=10

print(t[i in range(0,1)]) #output 10, in range(0,1) returns only 0 so t[0] is printed 10

Answer 2

t = 10, 20, 30

# basic slicing
print(t[0]) # 10
print(t[1]) # 20
print(t[2]) # 30

print()

# negative slicing
print(t[-1]) # 30
print(t[-2]) # 20
print(t[-3]) # 10

'''
range(len(t)) is the same as range(3)

range(3) will give the iterations of
0, 1, 2

So t[i-1] is the same as saying
t[-1] # 0 -1= -1
t[0] # 1 -1 = 0
t[1] # 2 -1 = 1
'''

Answer 3

Thank you all for your help