Introduction to Python
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Project Warmup Exercise Solutions, Session 9
| Ex. 9.1 | Write a function addme() that takes two arguments, adds them together and returns the two arguments added / concatenated. |
def addme(arg1, arg2):
adx = arg1 + arg2
return adx
x = addme(4, 5)
print(x)
y = addme('hey', 'you')
print(y)
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| Ex. 9.2 | Create a module file named yourname.py where yourname is your first name. |
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Create a def hello: function (that prints hello, world!) inside the yourname.py module. |
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In a file called yourname.py
def hello():
print('hello, world!')
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| Ex. 9.3 | Modify the above function to include an optional argument. If name=[something], print hello, [something]! instead of hello, world! But if the name= parameter is not passed, revert to saying hello, world! |
def hello(name=None):
if not name:
name = 'world'
print(f'hello, {name}!')
## even more succinct -- put the default value in the arg list:
def hello(name='world'):
print(f'hello, {name}!')
hello(name='Joe') # hello, Joe!
hello() # hello, world!
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| Ex. 9.4 | Create a function getlines(filename) that takes a filename, opens the file for that filename, copies the lines of the file (i.e., from the file method .readlines()) to a list variable, and then returns the list. In the calling code, call the function with a known filename, and assign the return value of the call to a variable. Loop through the variable (of course it is a list) and print out each line in the file. |
def getlines(filename):
fh = open(filename)
lines = fh.readlines()
return lines
lines = getlines('../student_db.txt')
for line in lines:
print(line) # prints each line in file
fh.close()
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