# loops.py
# Walker M. White (wmw2)
# September 30, 2012
"""Simple module showing off for loops"""
import string

def simple_for(seq):
    """Prints out each element of the list seq
    
    Precondition: seq a sequence (string or list)"""
    for x in seq:
        print 'Current element is '+`x`


def count_for(seq):
    """Prints out each element of the list seq (with counter)
    
    Precondition: seq a sequence (string or list)"""
    counter = 0 # tracks the current element of the list
    for x in seq:
        print 'The element in position '+`counter`+' is '+`x`
        counter = counter + 1 # increment the counter


def num_digits(s):
    """Returns: number of chars in s that are digits
    
    Precondition: s a string"""
    total = 0  # Holds the digit count
        
    for c in s:
        if c in string.digits:
            total = total + 1 # Increment if character is a digit
    
    return total


def no_blanks(s):
    """Returns: copy of s with no blanks
    
    Precondition: s a string"""
    result = '' # Holds the copy string
    
    for c in s:
        if not c in string.whitespace:
            result = result+c # glue it to the result
    
    return result


def isprime(n):
    """Returns: True if no integer in 2..n-1 divides n, else False
    
    Precondition: n > 1 an int"""
    result = True
    
    for x in range(2,n):
        if n % x == 0:   # x "goes evenly" into n
            result = False
    
    return result


def sum_of_odd_squares(m, n):
    """Returns: sum of squares of odd integers in the range m..n.
    
    Precondition: n >= m are ints"""
    total = 0
  
    for x in range(m,n):
        if x % 2 == 1:   # odd
            total = total + (x*x)
    
    return total