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Core Python Programming Exercises Chapter 6

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.

#!/usr/bin/env python
2

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

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

'''
6

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

'''
9

import string
11

import keyword
12

'''
14

'''
15

alphas = string.letters + '_'
17

nums = string.digits
18

alphas_nums = alphas+nums
19

kwlist = keyword.kwlist
20

def isPythonId(s):
22

if not s: return False
23

if not len(s): return False
24

if s[0] not in alphas: return False
25

for c in s:
26

if c not in alphas_nums: return False
27

if s in kwlist: return False
28

return True
29

if __name__ == '__main__':
31

'''
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:
35

myInput = raw_input("Identifier to test? ('exit' for over).\n>>>")
36

if myInput == 'exit':break
37

if isPythonId(myInput):
38

print "'%s' is a valid id" % myInput
39

else:
40

print "'%s' is an invalid id" % myInput
41

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.

#!/usr/bin/env python
2

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

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

'''
6

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

'''
9

'''
12

'''
13

if __name__ == '__main__':
16

'''
17

'''
18

nums=[]
19

while True:
20

myInput = raw_input("Enter an Integer ('exit' for over).\n>>>")
21

if myInput == 'exit':break
22

try:
23

i=int(myInput)
24

nums.append(i)
25

except:
26

print 'Error Number',
27

templist=list(nums)
29

nums.sort()
30

nums.reverse()
31

print nums
32

for i in range(0,len(templist),1):
33

for j in range(i+1,len(templist),1):
34

if str(templist[i])<str(templist[j]):
35

templist[i],templist[j]=templist[j],templist[i]
36

print templist
37

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.)

#!/usr/bin/env python
2

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

#$Id: p0605.py 133 2010-04-25 11:16:34Z xylz $
4

'''
6

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

'''
9

def trim(s):
11

'''
12

Take a string and remove all leading and trailing whitespace.
13

'''
14

if s is None:return None
15

if len(s)==0:return ''
16

ret=[]
17

for i in range(0,len(s),1):
18

c=s[i]
19

if c != ' ' and c != '\t' and c!= '\r' and c!='\n':
20

s=s[i:]
21

break
22

if i==len(s)-1:return ''
23

for j in range(len(s)-1,-1,-1):
24

c=s[j]
25

if c!=' ' and c!='\t' and c!='\r' and c!='\n':
26

s=s[:j+1]
27

break
28

if j==0:return ''
29

return s
30

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"]:
37

ns=trim(s)
38

print "'%s' => '%s', len=%d" % (s,ns,len(ns))
39

posted on 2010-04-21 22:25 imxylz 閱讀(16899) 評論(0) 編輯收藏所屬分類: Python

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