列表的练习

列表的练习

1.求列表的最大数和下标

nums = [3, 1, 9, 8, 4, 2, 0, 7, 5]
nums.sort()
print(nums)

nums.sort(reverse=True)
print(nums[0])

x = nums[0]  # 假设第0个是最大数
index = 0
for num in nums:
    if num > x:  # 如果发现列表里存在比假设还要大的数字
        # 说明假设不成立，把假设的值设置为发现的数字
        x = num
print('发现的最大数是%d' % x)


i = 0
while i < len(nums):
    if nums[i] > x:
        x = nums[i]
        index = i
    i += 1

print('发现的最大数是%d，它的下标是%d' % (x, index))

2.删除列表里的空字符串

words = ['hello', 'good', '', '', 'yes', 'ok', '']
# x = ['hello','good','yes','ok']
# 在使用for...in 循环遍历列表时，最好不要对元素进行增删操作
# for word in words:
#     if word == '':
#         words.remove(word)
# print(words)

# i = 0
# while i < len(words):
#     if words[i] == '':
#         words.remove(words[i])
#         i -= 1
#     i += 1
# print(words)

words2 = []
for word in words:
    if word != '':
        words2.append(word)
print(words)