if not A :
continue
B
루프문에서 사용하면, A를 찾을때만 B를 실행한다.
continue는 이번 루프를 skip하라는 의미이다.
# Use the file name mbox-short.txt as the file name
fname = input("Enter file name: ")
fh = open(fname)
s = 0
n = 0
for line in fh:
if not line.startswith("X-DSPAM-Confidence:"):
continue
# print(line)
pos = line.find("0")
num = line[pos:]
fnum = float(num)
s = s + fnum
n = n + 1
# print(fnum)
print("Average spam confidence:", s / n)
# print("Done")