1、文字基本操作

text1 = 'Python is a widely used high-level programming language for general-purpose programming, created by Guido van Rossum and first released in 1991.'
# 字元個數
print(len(text1))

# 獲取單詞
text2 = text1.split(' ')
print('單詞個數：', len(text2))
# 找出含有長度超過3的單詞
print([w for w in text2 if len(w) > 3
 
])
# 找出首字母大寫的單詞
print([w for w in text2 if w.istitle()])
# 以字母s結尾的單詞
print([w for w in text2 if w.endswith('s')])
# 找出不重複的單詞
text3 = 'TO be or not to be'
text4 = text3.split(' ')
print('單詞個數：', len(text4))
print('不重複的單詞個數：', len(set(text4)))
# 忽略大小寫統計
set([w.lower() for w in text4])
print(len(set([w.lower
 
() for w in text4])))

2、 文字清洗

text5 = '            A quick brown fox jumped over the lazy dog.  '
text5.split(' ')
print(text5)
text6 = text5.strip()
print(text6)
text6.split(' ')
# 去掉末尾的換行符
text7 = 'This is a line\n'
text7.rstrip()
print(text7)

3、 正則表示式

text8 = '"Ethics are built right into the ideals and objectives of the United Nations" #UNSG @ NY Society for Ethical Culture bit.ly/2guVelr @UN @UN_Women'
 

print(text8)
text9 = text8.split(' ')
print(text9)
# 查詢特定文字
# #開頭的文字
print([w for w in text9 if w.startswith('#')])
# @開頭的文字
print([w for w in text9 if w.startswith('@')])
# 根據@後的字元的樣式查詢文字
# 樣式符合的規則：包含字母，或者數字，或者下劃線
import re
print([w for w in text9 if re.search('@[A-Za-z0-9_]+', w)])
text10 = 'ouagadougou'
print(re.findall('[aeiou]', text10))
print(re.findall('[^aeiou]', text10))