Learning-Python

Content

• Python basic
• Python for Scientific Computing
  • numpy
  • matplotlib
• Python for Web
  • regular expression
  • web crawler
    • extracting links < a href="< url>">
  • web pages rank

Python Challenge: 2. string.maketrans()

Pythom basic

• Why do we need to invent new languages like Python to program computers, rather than using natural languages like English or Mandarin?
  • Ambiguity
  • Verbosity

Python for Scientific Computing

Python for Web

Regular Expression

import re
re.findall(<Regular Expression>, <text>)  

Symbol	Meaning
^	Matches the begining of the line
$	Matches the end of the line
.	Matches any character
\s	Matches whitespace
\S	Matches any non­whitespace character
*	Repeats a character 0 or more times
*?	Repeats a character 0 or more times (non­greedy)
+	Repeats a character 1 or more times
+?	Repeats a character 1 or more times(non­greedy)
[aeiou]	Matches a single character in the listed set
[^XYZ]	Matches a single character not in the listed set
[a-z0-9]	The set of characters can include a range
(	Indicates where string extraction is to start
)	Indicates where string extraction is to end