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edXAndrew2012
Group Title
Someone please help me understand how this returns what it returns. The process. I kinda get the first part how variable which is 0 divided by 4 returns 0. but how come it doesnt show 0 for the second if statement and prints 4 first, then 4 then 12 then 16
for variable in range(20):
if variable % 4 == 0:
print variable
if variable % 16 == 0:
print ('foo!')
 one year ago
 one year ago
edXAndrew2012 Group Title
Someone please help me understand how this returns what it returns. The process. I kinda get the first part how variable which is 0 divided by 4 returns 0. but how come it doesnt show 0 for the second if statement and prints 4 first, then 4 then 12 then 16 for variable in range(20): if variable % 4 == 0: print variable if variable % 16 == 0: print ('foo!')
 one year ago
 one year ago

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celmata Group TitleBest ResponseYou've already chosen the best response.1
From http://docs.python.org/2/reference/expressions.html : "The % (modulo) operator yields the remainder from the division of the first argument by the second. The numeric arguments are first converted to a common type. A zero right argument raises the ZeroDivisionError exception. The arguments may be floating point numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.) The modulo operator always yields a result with the same sign as its second operand (or zero); the absolute value of the result is strictly smaller than the absolute value of the second operand [2]." Now let's examine your programs output: 0 // 0 % 4 == 0 foo! // 0 % 16 == 0 4 // 4 % 4 = 0 8 // 8 % 4 == 0 12 // 12 % 4 == 0 16 // 16 % 4 == 0 foo! // 16 % 16 == 0 Which is indeed correct. The second statement, where variable has a value of 1, does not print any statements because both conditions fail: 1 / 4 == 0.25 1 / 16 == 0.0625 Does this make sense?
 one year ago

edXAndrew2012 Group TitleBest ResponseYou've already chosen the best response.0
somewhat...the picture is a little clearer. I read your definition and understand somewhat. Do you think you can make your response more plain (python for dummies). I made the connection with the first 2 lines of output but the rest I still dont.
 one year ago

celmata Group TitleBest ResponseYou've already chosen the best response.1
Have you tried calculating the third iteration of your loop by hand? So, you need to evaluate the statement: (2 % 4) == 0 In certain cases such as this, when you are working with a new operator it can be a good idea to create a test program. In this case you might want to calculate n % 4, given some value of n. This allows you to test your understanding and assumptions.
 one year ago

celmata Group TitleBest ResponseYou've already chosen the best response.1
Something like, for variable in range(20): print str(variable) + ' % 4 = ' + str(variable % 4) print str(variable) + ' % 16 = ' + str(variable % 16) print '\n' for example.
 one year ago

edXAndrew2012 Group TitleBest ResponseYou've already chosen the best response.0
Ok after running your example and studying it, I have a better understanding. Thanks for your help.
 one year ago
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