I am interested in how many times letter "y" occurs in the string.
Just write this in Python Shell:
>>> str.count('syzygy', 'y') 3
or
>>> 'syzygy'.count('y') 3
>>> str.count('syzygy', 'y') 3
>>> 'syzygy'.count('y') 3
def convert_to_celsius(fahrenheit): '''(number) -> float Return the number of Celsius degrees equivalent to fahrenheit degrees >>> convert_to_celsius(32) 0.0 >>> convert_to_celsius(212) 100.0 ''' return (fahrenheit - 32) * 5 / 9 def colder_temperature(temp1, temp2): '''(number, number) -> number Return the colder of the two temperatures, temp1 (degrees Celsius) and temp2 (degrees Fahrenheit), in degrees Celsius. ''' return
>>> import doctest >>> doctest.testmod() TestResults(failed=0, attempted=2) >>> >>>#--> If falied=0, then the function is correct