complete ex1-ex4

ex1.py

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+print "Hello World!"
+print "Hello Again"
+print "I like typing this."
+print "This is fun."
+print 'Yay! Printing.'
+print "I'd much rather you 'not'."
+print 'I "said" do not touch this.'

ex2.py

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+# A comment, this is so you can read your program later.
+# Anything after the # is ignored by python.
+
+print "I could have code like this." # and the comment after is ignored
+
+# You can also use a comment to "disable" or comment out a piece of code:
+# print "This won't run."
+
+print "This will run."

ex3.py

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+# 在console输出
+print "I will now count my chickens:"
+
+# 在console输出，逗号后的部分做计算
+print "Hens", 25 + 30 / 6
+print "Roosters", 100 - 25 * 3 % 4
+
+# 在console输出
+print "Now I will count the eggs:"
+
+# 计算
+print 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6
+
+# 在console输出
+print "Is it true that 3 + 2 < 5 - 7?"
+
+# 在console输出不等式两边比较大小的结果
+print 3 + 2 < 5 - 7
+
+# 在cosole输出，并做计算
+print "What is 3 + 2?", 3 + 2
+print "What is 5 - 7?", 5 - 7
+
+# 在console输出
+print "Oh, that's why it's False."
+
+# 在console输出
+print "How about some more."
+
+# 在console输出，并比较不等式两边的大小
+print "Is it greater?", 5 > -2
+print "Is it greater or equal?", 5 >= -2
+print "Is it less or equal?", 5 <= -2

ex4.py

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+cars = 100
+space_in_a_car = 4.0
+drivers = 30
+passengers = 90
+cars_not_driven = cars - drivers
+cars_driven = drivers
+carpool_capacity = cars_driven * space_in_a_car
+average_passengers_per_car = passengers / cars_driven
+
+
+print "There are", cars, "cars available."
+print "There are only", drivers, "drivers available."
+print "There will be", cars_not_driven, "empty cars today."
+print "We can transport", carpool_capacity, "people today."
+print "We have", passengers, "to carpool today."
+print "We need to put about", average_passengers_per_car, "in each car."