python中for else慎用

for后面的else只有在执行循环体中执行break的情况下才不执行，否则不管正常循环，空循环，continue等都会执行

# demo1
out = []
for people in ["孙悟空", "唐三藏", "猪八戒"]:
    out.append(people)
else:
    out.append("over")
print(",".join(out))
# 孙悟空,唐三藏,猪八戒,over


# demo2
out = []
for people in ["孙悟空", "唐三藏", "猪八戒"]:
    if people == "唐三藏":
        continue
    out.append(people)
else:
    out.append("over")
print(",".join(out))
# 孙悟空,猪八戒,over


# demo3
out = []
for people in ["孙悟空", "唐三藏", "猪八戒"]:
    if people == "唐三藏":
        break
    out.append(people)
else:
    out.append("over")
print(",".join(out))
# 孙悟空


# demo4
out = []
for people in []:
    out.append(people)
else:
    out.append("over")
print(",".join(out))
# over