how __iter__() works ?

Question

I have tried to understand the magic method in python but I couldn't get through __iter__(). So help me if you know. I will post my code down here

###############################################
# __len__ for len() checked
# __getitem__ for indexing checked
# __setitem__ for assigning to indexed values checked
# __delitem__ for deleting indexed values checked
# __iter__ for iteration over objects (e.g., in for loops) ?helpme if you know
# __contains__ for in checked

class VagueList:
def __init__(self, cont):
self.cont = cont

def __getitem__(self, index):
return self.cont[index]

def __len__(self):
return len(self.cont)
def __setitem__(self,index,value):
self.cont[index] = value
def __delitem__(self,index):
del self.cont[index]
def __contains__(self,param1):
return True if param1 in self.__dict__.keys() else False

vague_list = VagueList(["A", "B", "C", "D", "E"])
print(len(vague_list))
vague_list[0]= "t"
del vague_list[3]
print(len(vague_list))
for i in range(len(vague_list)):
print(vague_list[i])
print('cont' in vague_list)
######################################################

Answer 1

def __iter__(self):
for i in range(self):
yield self[i]

# or even:

def __iter__(self):
for i in range(len(self.cont)):
yield self.cont[i]

# so you could do:

for v in vague_list:
print(v)

Answer 2

__iter__ should be a generator function (ie using 'yield' keyword to return values wich should result from iterating the object)

Answer 3

could u clarify that by coding, please?