python - 在 Python 中使用 For 循环代替 While 循环

Question

i = 0
numbers = []

while i < 6:
    print "At the top i is %d" % i
    numbers.append(i)

    i = i + 1
    print "Numbers now: ", numbers
    print "At the bottom i is %d" % i


print "The numbers: "

for num in numbers:
    print num

如何for仅使用循环获得确切的输出。我尝试了一些事情，但它根本不会发生。有可能吗？

Answer 1

最简单的代码直接翻译是：

#!/usr/bin/env python

i = 0
numbers = []

for j in xrange(6):
    print "At the top i is %d" % i
    numbers.append(i)

    i = i + 1
    print "Numbers now: ", numbers
    print "At the bottom i is %d" % i


print "The numbers: "

for num in numbers:
    print num

list以这种方式构造 a时，列表推导通常是一种更好的方法：

#!/usr/bin/env python

numbers = [i for i in xrange(6)]

print "The numbers: "

for num in numbers:
    print num

在这种情况下，您的代码可以进一步简化：

#!/usr/bin/env python

print "The numbers: "
for num in xrange(6):
    print num

Answer 2

如果您只关心“精确输出”，那么：

numbers = []
for i in range(6):
    print("At the top i is %d" %i)
    numbers.append(i)
    print("Numbers now: ", numbers)
    print("At the bottom i is %d" %(i+1))
print("The numbers: ")
[print(num) for num in numbers]

蟒蛇3。