漾怎么组词,异形陨石txt,西印度群岛位于哪里
name = 'rayn' print(type(name))
<class 'str'>
nums = 123 print(type(nums)) nums = str(123) print(type(nums))
<class 'int'> <class 'str'>
name = 'rayn handsome' print(name[0]) ## 整向取值,取第一个索引值 print(name[-1]) ## 反向取值
r e
name = 'rayn handsome' print(name[0:5]) ## 正向取值,步长默认为1,索引范围是0-5:就是说取前四个字符 print(name[0:5:2]) ## 正向取值,步长为2,取前四个字符中的第一个和第三个 print(name[-4:]) ## 正向取值,步长为1,取后面四个字符 print(name[-1:-5:-1]) ## 反向取值,步长为1,取后面四个字符,且顺序是反的
rayn ry some emos
name = 'rayn handsome' ## 注意单引号里面的空格也是字符串 print(len(name))
13
name = 'rayn handsome' print('rayn'in name) print('nick'in name) print('rayn'not in name)
true false false
name = ' rayn handsome ' print(name) print(name.strip())
rayn handsome rayn handsome
name = ' rayn handsome ' print(name.split()) print(name.split('h'))
['rayn', 'handsome'] [' rayn ', 'andsome ']
name = ' rayn handsome ' for i in name: print(i)
r
a
y
n
h a n d s o m e
lstrip 和 rstrip
lower 和 upper # 小写 和 大写
startswith 和 endswith # 以...开始 和 以...结尾
rsplit # 右切分
join # 合并
replace # 替换
isdigit # 是否是数字类型
name = ' rayn handsome ' print(name.lstrip()) print(name.rstrip())
rayn handsome rayn handsome
name = ' rayn handsome ' print(name.lower()) print(name.upper())
rayn handsome rayn handsome
name = 'rayn handsome ' print(name.startswith('r')) print(name.endswith('h'))
true false
name = 'rayn handsome ' print(name.rsplit('s'))
['rayn hand', 'ome ']
lis = ['rayn','handsome','shuai'] print('='.join(lis))
rayn=handsome=shuai
name = 'rayn handsome ' print(name.replace('handsome','taishuai'))
rayn taishuai
name = 'rayn handsome ' print(name.isdigit())
false
age = input('请输入年龄:') if age.isdigit(): age = int(age) else: print('不知道年龄是数字吗?')
请输入年龄:喔喔 不知道年龄是数字吗?
find / rfind / index / rindex /count
center / ljust /rjust / zfill
expandtabs
captalize / swapcase / title
is 系列
如对本文有疑问,请在下面进行留言讨论,广大热心网友会与你互动!! 点击进行留言回复
python求numpy中array按列非零元素的平均值案例
网友评论