my python study four | Python Fiddle

import re
def find(pat, text):
    match = re.search(pat, text) # left to right, find first match then return, or return none
    if match:
        print match.group()
    else:
        print "not found."

# add a 'r' in frount of a text, tells python not change this string, just pass it to the function.(usefull when the string have '\')
find(r'a.b', "asd aab aaaab")

# \w matchs [0-9][a-z][A-Z], one charector
find(r'\w\w\w', "a ab ab~ abc")

# \d matchs number
find(r'\d\d\d', "1, 12 12, 123")

# \s matchs space/tab
find(r'\d\s\d', "1 a 2  3; 1 1")

# \S matchs not space/tab
find(r'\S+', "  sdasdasd!@#$@!dsfds  * 11")

# +:1 or more; *: 0 or more
find(r'\w+', "!@#$#     this123123")

# []: match anything in the [] (in it, the '.' do not need '\')
# '.' matchs anything except \n???(one line) use DOTALL to change it
find(r'\w[\w.]*@\w[\w.]+', "asdf .@aa.com a@a.com .ffff@bb.com sdf@@ @")

# (): mark groups
m = re.search(r'(\w[\w.]*)@(\w[\w.]+)', "asdf .@aa.com .ffff@bb.com sdf@@ @")
print 'group=', m.group(), 'group(0)=', m.group(0)
print 'group(1)=', m.group(1), 'group(2)=', m.group(2)

# find all matchs
list = re.findall('\w+\s\w+', "this is a big word");
print list

# find all matchs as a tuple list
list = re.findall('(\w+)\s(\w+)', "this is a big word");
print list

################################## funny syntax ###############################################
a = [1, 2, 3, 4, 5, 6, 7]
b = [w*w  for w in a  if w > 3]
print b

################################################################################################

#!/usr/bin/python
# Copyright 2010 Google Inc.
# Licensed under the Apache License, Version 2.0
# http://www.apache.org/licenses/LICENSE-2.0

# Google's Python Class
# http://code.google.com/edu/languages/google-python-class/

"""
import sys
import re
import os
import glob
"""

"""Baby Names exercise

Define the extract_names() function below and change main()
to call it.

For writing regex, it's nice to include a copy of the target
text for inspiration.

Here's what the html looks like in the baby.html files:
...
<h3 align="center">Popularity in 1990</h3>
....
<tr align="right"><td>1</td><td>Michael</td><td>Jessica</td>
<tr align="right"><td>2</td><td>Christopher</td><td>Ashley</td>
<tr align="right"><td>3</td><td>Matthew</td><td>Brittany</td>
...

Suggested milestones for incremental development:
 -Extract the year and print it
 -Extract the names and rank numbers and just print them
 -Get the names data into a dict and print it
 -Build the [year, 'name rank', ... ] list and print it
 -Fix main() to use the extract_names list
"""

"""
def extract_names(filename):
  # +++your code here+++
  file = open(filename, 'r')
  text = file.read()
  yearMatch = re.search(r'Popularity in \d\d\d\d', text)
  nameTuples = re.findall(r'<tr align="right"><td>(\d+)</td><td>(\w+)</td><td>(\w+)</td>', text)
  dic = {}
  for nameTuple in nameTuples:
    name = nameTuple[1]
    dic[name] = nameTuple[0]
    name = nameTuple[2]
    dic[name] = nameTuple[0]
  dic = sorted(dic.items())
  if yearMatch:
    print(yearMatch.group())
  file.close()
  return dic

def main():
  # This command-line parsing code is provided.
  # Make a list of command line arguments, omitting the [0] element
  # which is the script itself.
  args = sys.argv[1:]

if not args:
    print('usage: [--summaryfile] file [file ...]')
    sys.exit(1)

# Notice the summary flag and remove it from args if it is present.
  summary = False
  if args[0] == '--summaryfile':
    summary = True
    del args[0]

# +++your code here+++
  # For each filename, get the names, then either print the text output
  # or write it to a summary file

for regFilename in args:
    filenames = glob.glob(regFilename)
    for filename in filenames:
      if os.path.isfile(filename):
        dic = extract_names(filename)
        if not summary:
          for (name, rank) in dic:
            print(name, rank)
        else:
          f = open(filename+'summary.txt', 'w')
          for (name, rank) in dic:
            f.write(name + ' ' + rank + '\n')
          f.close()

if __name__ == '__main__':
  main()

"""

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