Check 10.8
- First, create a lambda function
isEven, which takes an integer and returns True if it is even and False otherwise.
- Second, define the function
justEvens(lst) which takes a list of integers and returns a list containing only the even elements, in order. You must use either map, filter, or reduce! Your function may not use loops or recursion, and it must be one line long!
- Note: the autograder for this problem will only consider the first two lines of your submission.
isEven = #<-----write a lambda function!
def justEvens(lst): pass #<-----replace with your code!
def testJustEvens():
print("Testing justEvens...", end="")
assert(justEvens([100,123,99,13,12,22,15]) == [100, 12, 22])
assert(justEvens([20]) == [20])
assert(justEvens([21]) == [])
assert(justEvens([]) == [])
print("Passed!")
testJustEvens()
import sys
def set_certificate(certificate_div_id, certificate):
document[certificate_div_id].textContent = certificate
def get_student_code(student_code_div_id):
raw_student_code = document[student_code_div_id].textContent
return window.patchCodeToCheckTimeout(raw_student_code, 'check_timeout();');
class captureIO:
def __init__(self):
self.captured = []
def get_output(self):
out = ""
for c in self.captured:
out += str(c)
return out
def write(self, data):
self.captured.append(data)
def flush(self):
pass
def make_certificate(student_code_div_id, certificate_div_id):
certificate = []
student_code = get_student_code(student_code_div_id)
student_code = '\n'.join(student_code.splitlines()[:2])
try:
execCapture = captureIO()
sys.stdout = execCapture
sys.stderr = execCapture
exec(student_code)
if not "filter(" in student_code:
set_certificate(certificate_div_id, "No filter")
return
tests = [[20, 16, 6, 7, 14, 19, 7, 8, 1, 13, 4, 10, 6, 4], [], [10, 19, 6, 8, 2, 5, 20, 5, 3, 5, 0, 6, 12, 5, 5], [3, 16, 1, 2], [10, 3, 5, 14, 3, 1, 7], [7, 9, 13, 20, 18, 11, 10, 17, 16, 6, 18, 1, 4, 1], [1, 13, 10, 8, 4, 18, 6, 17, 16, 5, 16, 13, 12, 13, 19], [2, 2, 12, 11, 1, 18, 18, 8, 11, 17, 6, 7, 8, 13], [6, 7, 20, 2, 12, 8, 5, 13], [14, 12, 7, 17, 15, 13, 8, 20, 15, 13, 3, 14, 12, 1, 17], [3, 2, 4, 0, 6, 8], [], [13, 1, 4, 15, 2, 9, 2, 4, 18], [20, 15, 15, 0, 12, 19, 3, 0, 1, 3, 13], [7, 9, 3, 18, 5, 6, 11, 2, 17, 5, 11, 17, 13], [14, 1, 0, 17, 16, 3, 19, 17, 4, 13, 3], [19, 15, 19, 9, 19, 14, 2, 7, 17], [20, 13, 4], [12, 14, 2, 5, 15, 9], [19, 12, 15, 11], [], [17, 20, 16, 6, 9, 10, 20, 2, 7, 6, 16, 0], [20, 16, 4, 19, 17, 9, 2, 4, 13], [15, 18, 8, 0, 19, 9], [11, 2, 16, 12, 6, 10, 10, 3, 20, 10]]
for test in tests:
output = justEvens(test)
certificate.append((output, type(output)))
set_certificate(certificate_div_id, str(certificate))
except:
set_certificate(certificate_div_id, "error")