py-day1-4 python基本数据类型2

# replace 替换
text = 'xiaomafafafahaoyunlianlian'
v = text.replace('fa','shun')
x = text.replace('fa','shun',1)
print(v)
print(x)

xiaomashunshunshunhaoyunlianlian
xiaomashunfafahaoyunlianlian

断句：expandtabs( number)

name = "nihao"    # isalpha()字符串中是否只包含字母
v = name.isalpha()
print(v)

number = ''    # isalnum() 字符串中是否只包含数字
v = number.isalnum()
print(v)

# isspace() 判断是否都是空格
name = ' '
v = name.isspace()
print(v)

# istitle()  判断是否是标题（首字母大写）
test = 'Ni Hao zhong guo'
v = test.istitle()
print(v)

test = 'Ni Hao Zhong Guo'
v = test.istitle()
print(v)

# join 将字符串中的每一个元素按照指定分隔符进行拼接
test = '你是风儿我是沙'
m = "*"
v = m.join(test)
print(v)

你*是*风*儿*我*是*沙

# center()   中间填充
test = '好好学习'
v = test.center(20,'*')
print(v)

********好好学习********

# ljust() 向右填充
test = '好好学习'
v = test.ljust(20,"*")
print(v)

好好学习****************

# rjust() 向左填充
test = '好好学习'
v = test.rjust(20,"*")
print(v)

****************好好学习

# zfill()  固定向左以0填充
test = '好好学习'
v = test.zfill(20)
print(v)

0000000000000000好好学习

# islower() 判断是否全部是大写
# lower()  转换为大小写
test = 'Majun'
v1 = test.islower()
v2 = test.lower()
print(v1,v2)

False majun

# lstrip()  去除左边的空格
name = ' majun '
v = name.lstrip()
print(v)

majun

# rstrip() 去除右边的空格
name = ' majun '
v = name.rstrip()
print(v)

  majun

# strip() 去除两边的空格
name = ' majun '
v = name.strip()
print(v)

majun