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How to delete characters in python

藏色散人
藏色散人Original
2019-10-17 14:03:275068browse

How to delete characters in python

How to delete characters in python?

Python removes unwanted characters from strings:

Problem:

Filter extraneous whitespace characters before and after user input

      ‘    ++++abc123---    ‘

Filter '\r' in the edited text under a certain windows:

     ‘hello world \r\n'

Remove the unicode combination characters in the text, tone

     "Zhào Qián Sūn Lǐ Zhōu Wú Zhèng Wáng"

Recommended: "Python Tutorial

How to solve the above problems?

Remove strings at both ends: strip(), rstrip(),lstrip()

#!/usr/bin/python3
  
s = ' -----abc123++++  '
  
# 删除两边空字符
print(s.strip())
  
# 删除左边空字符
print(s.rstrip())
  
# 删除右边空字符
print(s.lstrip())
  
# 删除两边 - + 和空字符
print(s.strip().strip('-+'))

Delete a single fixed-position character: slice splicing

#!/usr/bin/python3
  
s = 'abc:123'
# 字符串拼接方式去除冒号
new_s = s[:3] + s[4:]
print(new_s)

Delete characters at any position simultaneously Delete multiple different characters: replace(), re.sub()

#!/usr/bin/python3
  
# 去除字符串中相同的字符
s = '\tabc\t123\tisk'
print(s.replace('\t', ''))
  
  
import re
# 去除\r\n\t字符
s = '\r\nabc\t123\nxyz'
print(re.sub('[\r\n\t]', '', s))

Delete multiple different characters at the same time: translate()

Map str.maketrans() in py3

#!/usr/bin/python3
  
s = 'abc123xyz'
# a _> x, b_> y, c_> z,字符映射加密
print(str.maketrans('abcxyz', 'xyzabc'))
# translate把其转换成字符串
print(s.translate(str.maketrans('abcxyz', 'xyzabc')))

Remove the tones in unicode characters

#!/usr/bin/python3
  
import sys
import unicodedata
s = "Zhào Qián Sūn Lǐ Zhōu Wú Zhèng Wáng"
remap = {
 # ord返回ascii值
 ord('\t'): '',
 ord('\f'): '',
 ord('\r'): None
 }
# 去除\t, \f, \r
a = s.translate(remap)
'''
  通过使用dict.fromkeys() 方法构造一个字典,每个Unicode 和音符作为键,对于的值全部为None
  然后使用unicodedata.normalize() 将原始输入标准化为分解形式字符
  sys.maxunicode : 给出最大Unicode代码点的值的整数,即1114111(十六进制的0x10FFFF)。
  unicodedata.combining:将分配给字符chr的规范组合类作为整数返回。 如果未定义组合类,则返回0。
'''
cmb_chrs = dict.fromkeys(c for c in range(sys.maxunicode) if unicodedata.combining(chr(c))) #此部分建议拆分开来理解
b = unicodedata.normalize('NFD', a)
'''
   调用translate 函数删除所有重音符
'''
print(b.translate(cmb_chrs))

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