def histogram(li):
for n in li:
print generate_n_chars(n, '*')
Define a function generate_n_chars() that takes an integer n and a character c and returns a string, n characters long,
consisting only of c:s. For example, generate_n_chars(5,"x") should return the string "xxxxx".
(Python is unusual in that you can actually write an expression 5 * "x" that will evaluate to "xxxxx".
For the sake of the exercise you should ignore that the problem can be solved in this manner.)
"""
def generate_n_chars(n, c):
result = ''
for i in range(n):
result += c
return result
if __name__ == "__main__":
print generate_n_chars(3, 'c')
###########ex12
#!/usr/bin/env python
"""
Define a procedure histogram() that takes a list of integers and prints a histogram to the screen.
For example, histogram([4, 9, 7]) should print the following:
****
*********
*******
"""
from ex11 import generate_n_chars
def test_01(self): result = generate_n_chars(5, 'x') self.assertEqual(result, 'xxxxx')
def test_bad_type(self): data = 'banana' with self.assertRaises(TypeError): result = generate_n_chars(data)
def test_02(self): result = generate_n_chars(10, 'a') self.assertEqual(result, 'aaaaaaaaaa')
def histogram(li):
for n in li:
print generate_n_chars(n, '*')