initial creation

py3interm/EXAMPLES/gen_ex.py

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+#!/usr/bin/env python
+
+# sum the squares of a list of numbers
+# using list comprehension, entire list is stored in memory
+s1 = sum([x * x for x in range(10)])  # <1>
+
+# only one square is in memory at a time with generator expression
+s2 = sum(x * x for x in range(10))  # <2>
+print(s1, s2)
+print()
+
+page = open("../DATA/mary.txt")
+m = max(len(line) for line in page)  # <3>
+page.close()
+print(m)