将 for 循环转换为 while 循环 Python

Question

我正在尝试将此 for 循环转换为 while 循环，但我正在苦苦挣扎。它应该具有相同的输出

low = 3
hi = 50
total = 0
for m in range (hi, low-1,-2):
      total = total + m
print("Total is", total)

Answer 1

low = 3
hi = 50
total = 0
m = hi
while m>low-1
   total = total + m
   m = m-2
print("Total is", total)

Answer 2

这样的事情会起作用：

low = 3
hi = 50
total = 0

# summing every 2nd number from 50 down to 4, inclusive 
# (including hi=50, excluding low-1=2)
for m in range(hi, low-1,-2):
    print(m)
    total = total + m
print("Total is", total)

print("---")
total = 0
i = hi # set index to hi
while i >= low: # as long as index is greater than or equal to low,
    print(i)
    total += i
    i -= 2 # decrease index by 2
print("Total is", total)

如果你比较这两个代码，你会发现它们确实是相等的。