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6-2.

String Identifiers. Modify the idcheck.py script in Example 6-1 such that it will determine the validity of identifiers of length 1 as well as be able to detect if an identifier is a keyword. For the latter part of the exercise, you may use the keyword module (specifically the keyword.kwlist list) to aid in your cause.

1

#!/usr/bin/env python
2

#-*- coding:utf-8 -*-
3

#$Id: p0602.py 131 2010-04-21 14:20:10Z xylz $
4

5

'''
6

This is a 'python' study plan for xylz.
7

Copyright (C)2010 xylz (www.imxylz.info)
8

'''
9

10

import string
11

import keyword
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13

'''
14

'''
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16

alphas = string.letters + '_'
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nums = string.digits
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alphas_nums = alphas+nums
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kwlist = keyword.kwlist
20

21

def isPythonId(s):
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if not s: return False
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if not len(s): return False
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if s[0] not in alphas: return False
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for c in s:
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if c not in alphas_nums: return False
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if s in kwlist: return False
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return True
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30

if __name__ == '__main__':
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'''
32

String Identifiers. Modify the idcheck.py script in Example 6-1 such that it will determine the validity of identifiers of length 1 as well as be able to detect if an identifier is a keyword. For the latter part of the exercise, you may use the keyword module (specifically the keyword.kwlist list) to aid in your cause.
33

'''
34

while True:
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myInput = raw_input("Identifier to test? ('exit' for over).\n>>>")
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if myInput == 'exit':break
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if isPythonId(myInput):
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print "'%s' is a valid id" % myInput
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else:
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print "'%s' is an invalid id" % myInput
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42

6-3. Sorting.
Enter a list of numbers and sort the values in largest-to-smallest order.
Do the same thing, but for strings and in reverse alphabetical (largest-to-smallest lexicographic) order.

1

#!/usr/bin/env python
2

#-*- coding:utf-8 -*-
3

#$Id: p0603.py 132 2010-04-25 10:22:05Z xylz $
4

5

'''
6

This is a 'python' study plan for xylz.
7

Copyright (C)2010 xylz (www.imxylz.info)
8

'''
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10

11

'''
12

'''
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14

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if __name__ == '__main__':
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'''
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'''
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nums=[]
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while True:
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myInput = raw_input("Enter an Integer ('exit' for over).\n>>>")
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if myInput == 'exit':break
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try:
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i=int(myInput)
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nums.append(i)
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except:
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print 'Error Number',
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templist=list(nums)
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nums.sort()
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nums.reverse()
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print nums
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for i in range(0,len(templist),1):
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for j in range(i+1,len(templist),1):
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if str(templist[i])<str(templist[j]):
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templist[i],templist[j]=templist[j],templist[i]
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print templist
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38

6-6.

Strings. Create the equivalent to string.strip(): Take a string and remove all leading and trailing whitespace. (Use of string.*strip() defeats the purpose of this exercise.)

1

#!/usr/bin/env python
2

#-*- coding:utf-8 -*-
3

#$Id: p0605.py 133 2010-04-25 11:16:34Z xylz $
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5

'''
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This is a 'python' study plan for xylz.
7

'''
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def trim(s):
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'''
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Take a string and remove all leading and trailing whitespace.
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'''
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if s is None:return None
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if len(s)==0:return ''
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ret=[]
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for i in range(0,len(s),1):
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c=s[i]
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if c != ' ' and c != '\t' and c!= '\r' and c!='\n':
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s=s[i:]
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break
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if i==len(s)-1:return ''
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for j in range(len(s)-1,-1,-1):
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c=s[j]
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if c!=' ' and c!='\t' and c!='\r' and c!='\n':
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s=s[:j+1]
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break
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if j==0:return ''
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return s
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31

32

if __name__ == '__main__':
33

'''
34

Create the equivalent to string.strip(): Take a string and remove all leading and trailing whitespace. (Use of string.*strip() defeats the purpose of this exercise.)
35

'''
36

for s in [" a book "," a book","a book",""," \r\n"]:
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ns=trim(s)
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print "'%s' => '%s', len=%d" % (s,ns,len(ns))
39

posted on 2010-04-21 22:25 imxylz 閱讀(16903) 評論(0) 編輯收藏所屬分類: Python

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