adding iteration code examples

Chapter6/iter_util/counter.py

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+#Counter.py
+from collections import Counter
+
+#applying counter on a string object
+print(Counter("people"))
+
+#applying counter on a list object
+my_counter = Counter([1,2,1,2,3,4,1,3])
+print(my_counter.most_common(1))
+print(list(my_counter.elements()))
+
+#applying counter on a dict object
+print(Counter({'A': 2, 'B': 2, 'C': 4, 'C': 4}))
+

Chapter6/iter_util/itertools_accumulate.py

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+#itertools_accumulate.py
+import itertools
+import operator
+
+data = [1, 3, 5]
+res = itertools.accumulate(data)
+print("default:")
+for x in res:
+    print(x)
+res = itertools.accumulate(data, operator.mul)
+print("Multiply:" )
+for x in res:
+    print(x)

Chapter6/iter_util/itertools_chain.py

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+#itertools_chain.py
+import itertools
+
+list1 = ['A','B','C']
+list2 = ['W','X','Y','Z']
+
+chained_iter = itertools.chain(list1, list2)
+for x in chained_iter:
+    print(x)

Chapter6/iter_util/itertools_compress.py

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+#itertools_compress.py
+import itertools
+
+letters = ['A','B','C']
+selector = [True, 0, 1]
+for x in itertools.compress(letters, selector):
+    print (x)

Chapter6/iter_util/itertools_count.py

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+#itertools_count.py
+import itertools
+
+iter = itertools.count(10, 2)
+print(next(iter))
+print(next(iter))

Chapter6/iter_util/itertools_cycle.py

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+#itertools_cycle.py
+import itertools
+
+letters = ['A','B','C']
+for letter in itertools.cycle(letters):
+    print(letter)
+letters = ['A','B','C']
+iter1, iter2 = itertools.tee(letters)
+
+for x in iter1:
+    print(x)
+
+for x in iter2:
+    print(x)

Chapter6/iter_util/itertools_groupby.py

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+#itertools_groupby.py
+import itertools
+
+mylist = [("A", 100), ("A", 200), ("B", 30), ("B", 10)]
+def get_key(group):
+    return group[0]
+
+for key, grp in itertools.groupby(mylist, get_key):
+    print(key + "-->", list(grp))

Chapter6/iter_util/itertools_repeat.py

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+#itertools_repeat.py
+import itertools
+
+for x in itertools.repeat('Python', times=5):
+    print(x)

Chapter6/iter_util/itertools_tee.py

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+#itertools_tee.py
+import itertools
+
+letters = ['A','B','C']
+iter1, iter2 = itertools.tee(letters)
+
+for x in iter1:
+    print(x)
+
+for x in iter2:
+    print(x)

Chapter6/iter_util/zip.py

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+#zip.py
+
+num_list = [1, 2, 3, 4, 5, 6]
+lett_list = ['alpha', 'bravo', 'charlie', 'delta']
+
+zipped_iter = zip(num_list,lett_list)
+print(next(zipped_iter))
+print(next(zipped_iter))
+print(list(zipped_iter))