数据处理13-1 Numpy 字符串函数

import numpy as np

# NumPy 字符串函数
# 字符串的连接
print('123'+'456')
# 数组字符串的连接add()函数
print(np.char.add(['123'],['456']))
print(np.char.add(['123','456'],['78','9']))
print(np.char.add(['山东省','河北省'],['济南市','石家庄市']))
# Excel 用&连接字符串，数据库用concat()函数

# 字符串重复几遍
print('abc'*3)
print(np.char.multiply(['a','b','c','d','e','f'],3))

# 通过填充字符让字符串居中
print(np.char.center(['a','bcd','efghi','jkl','m'],15,'-'))

# 将第一个字母转换成大写
print(np.char.capitalize(['my','school','is','good']))
print(np.char.capitalize(['zhangsan','lisi','wangwu']))

# title()函数，每个单词的首字母都大写
print(np.char.title(['zhang san','li si','wang wu']))

# 大小写转换
print(np.char.upper(['zhang san','li si','wang wu']))
print(np.char.lower(['ZHANG SAN','LI SI','WANG WU']))

# split()函数，将字符串进行分割
print(np.char.split(['today is rainy','tomorrow will be sunny']))
print(np.char.split(['1990-07-01','1992-03-29'],'-'))

# 以换行符进行分割
print(np.char.splitlines(['a\nbc','d\nef']))

# 去掉头尾的字符
print(np.char.strip(['  zhang san  ','   li si   '],' '))

# join()函数
print(np.char.join('-',['abc','def']))

# replace()函数
print(np.char.replace(['2007-09-01','2007-08-31'],'-','/'))