Python programming language. Iterators
Explore the power of iterators, from basics to custom implementations.
Unlock the potential of Python iterators! Learn what iterators are, how they work with the iterator protocol, and the difference between iterators and iterables. Discover built-in iterators like range, and implement custom ones for efficient looping and memory management.
Chapters:
00:00 Title Card
00:02 Understanding Python Iterators
Summary:
Iterators allow looping over collections
Enable sequential access to elements
Facilitate efficient data processingiterable = [1, 2, 3]
iterator = iter(iterable)
while True:
try:
item = next(iterator)
print(item)
except StopIteration:
break
00:04 The Iterator Protocol
Summary:
Defined by __iter__() and __next__()
Ensures object compliance with iteration
Supports custom iteration logicclass MyIterator:
def __init__(self):
self.num = 0
def __iter__(self):
return self
def __next__(self):
if self.num ❮ 3:
self.num += 1
return self.num
else:
raise StopIteration
00:06 Creating Custom Iterators
Summary:
Define __iter__() and __next__() methods
Implement specific iteration behavior
Control element access sequenceclass MyIterator:
def __iter__(self):
return self
def __next__(self):
if self.current ❯ 5:
raise StopIteration
self.current += 1
00:08 Built-in Python Iterators
Summary:
Include range, enumerate, zip
Simplify common iteration tasks
Provide ready-to-use iteration toolsfor i in range(5):
print("Item", i)
for i, v in enumerate(['a','b']):
print("Index", i, "Value", v)
for a, b in zip([1,2], ['x','y']):
print("Pair", a, b)
00:10 Iterator vs Iterable
Summary:
Iterators have __next__() method
Iterables have __iter__() method
Iterators can be iterablesclass MyIterator:
def __iter__(self):
return self
def __next__(self):
raise StopIteration
class MyIterable:
def __iter__(self):
return MyIterator()
00:12 Lazy Evaluation in Iterators
Summary:
Elements provided one at a time
Reduces memory usage
Efficient for large datasetsdef lazy_iter():
for i in range(5):
yield i
for num in lazy_iter():
print(num)
00:14 End Card
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