nums = [5, 12, 7, 9, 21, 7, 14]
aa = nums.count(7)
print("数字出现次数:",aa)
if 99 not in nums:
nums.append(99)
print("最新列表1:",nums)
bb = nums.remove(7)
print("最新列表2",nums)
cc = nums[1:4]
print("第2-4元素:",cc)
msg = "hello 123 WORLD"
dd = len(msg)
print("长度:",dd)
ff = sum(1 for ch in msg if ch.islower())
print("小写字母个数:",ff)
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
数字出现次数: 2
最新列表1: [5, 12, 7, 9, 21, 7, 14, 99]
最新列表2 [5, 12, 9, 21, 7, 14, 99]
第2-4元素: [12, 9, 21]
长度: 15
小写字母个数: 5