Chapter 1
Here is a sample interaction with a Python shell:
#The first statement asks Python to display the literal phrase Hello, World!.
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>>> print("Hello , World!")
Hello , World!
>>> print(2 + 3)
5
#Python prints the part in quotes, 2 + 3 =, followed by the result of adding 2 + 3, which is 5.
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>>> print("2 + 3 =", 2 + 3)
2 + 3 = 5
#The first line tells Python that we are defining a new function and we are naming it hello.
#The following lines are indented to show that they are part of the hello function.
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>>> def hello():
print ("Hello")
print("Computers are fun!")
>>> hello()
Hello
Computers are fun!
#An example of a customized greeting using a parameter.
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>>> def greet(person):
print("Hello", person)
print("How are you?")
#Now we can use our customized greeting.
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>>> greet("John")
Hello John
How are you?
>>>
>>> greet("Emily")
Hello Emily
How are you?
>>>
