python打开一个txt文件以后如何将标点去掉，并将剩下的单词转换为小写以后变为单词列表；并统计词数 python如何同时把字符串大写变小写，小写变大写
Python\u6e90\u6587\u4ef6\u6539\u5199.\u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u8bfb\u53d6\u4e00\u4e2aPython\u6e90\u7a0b\u5e8f\uff0c\u5c06\u6587\u4ef6\u4e2d\u6240\u6709\u9664\u4fdd\u7559\u5b57\u5916\u7684\u5c0f\u5199\u5b57\u6bcd\u6362\u6210\u5927\u5199\u5b57\u6bcd\u7a0b\u5e8f\u4ee3\u7801\u5982\u4e0b\uff1a
importkeyword\u3002
s=keyword.kwlist\u3002
#\u5efa\u7acb\u4fdd\u7559\u5b57\u5217\u8868\u3002
n=input("\u8f93\u5165\u4e00\u4e2a\u6587\u4ef6\u540d:")\u3002
f=open(n,"r").readlines()\u3002
ls=[]\u3002
foriinf:\u3002
i=i.split()\u3002
ls.append(i)\u3002
#\u5efa\u7acb\u4e00\u4e2a\u4ee5\u6bcf\u884c\u7684\u6240\u6709\u5355\u8bcd\u4e3a\u5143\u7d20\u7ec4\u6210\u7684\u4e00\u4e2a\u5217\u8868\u7ec4\u3002
foriinrange(len(ls)):
iff[i].isspace():
fo.write(""+"\n")
forjinrange(len(ls[i])):
x=ls[i][j]
ifxnotins:
x=x.upper()
else:
x=x.lower()
ifx==ls[i][len(ls[i])-1]:#\u5224\u5b9a\u662f\u5426\u904d\u5386\u81f3\u6bcf\u884c\u7684\u672b\u5c3e\u3002
fo.write(x+"\n")
else:
fo.write(x+"")
\u6269\u5c55\u8d44\u6599\uff1a
Include\uff1a\u8be5\u76ee\u5f55\u4e0b\u5305\u542b\u4e86\u63d0\u4f9b\u7684\u6240\u6709\u6587\u4ef6\u5934\uff0c\u5982\u679c\u7528\u6237\u9700\u8981\u81ea\u5df1\u7528C\u6216\u8005C++\u6765\u7f16\u5199\u81ea\u5b9a\u4e49\u6a21\u5757\u6269\u5c55Python\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u7528\u5230\u8fd9\u91cc\u63d0\u4f9b\u7684\u5934\u6587\u4ef6\u3002
Lib\uff1a\u8be5\u76ee\u5f55\u5305\u542b\u4e86Python\u81ea\u5e26\u7684\u6240\u6709\u6807\u51c6\u5e93\uff0cLib\u4e2d\u7684\u5e93\u90fd\u662f\u7528Python\u8bed\u8a00\u7f16\u5199\u7684\u3002
Modules\uff1a\u8be5\u76ee\u5f55\u4e2d\u5305\u542b\u4e86\u6240\u6709\u7528C\u8bed\u8a00\u7f16\u5199\u7684\u6a21\u5757\uff0c\u6bd4\u5982random\u3001cStringIO\u7b49\u3002Modules\u4e2d\u7684\u6a21\u5757\u662f\u90a3\u4e9b\u5bf9\u901f\u5ea6\u8981\u6c42\u975e\u5e38\u4e25\u683c\u7684\u6a21\u5757\uff0c\u800c\u6709\u4e00\u4e9b\u5bf9\u901f\u5ea6\u6ca1\u6709\u592a\u4e25\u683c\u8981\u6c42\u7684\u6a21\u5757\uff0c\u6bd4\u5982os\uff0c\u5c31\u662f\u7528Python\u7f16\u5199\uff0c\u5e76\u4e14\u653e\u5728Lib\u76ee\u5f55\u4e0b\u7684\u3002
\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7str\u7c7b\u7684swapcase\u65b9\u6cd5\u53ef\u4ee5\u5feb\u901f\u5b9e\u73b0\u5927\u5199\u4fbf\u5c0f\u5199\u3001\u5c0f\u5199\u53d8\u5927\u5199\u7684\u529f\u80fd\uff0c\u53c2\u8003\u4ee3\u7801\u5982\u4e0b\uff1a
In[1]:s='BaiduZhidao'
In[2]:s.swapcase()
Out[2]:'bAIDUzHIDAO'
Python\u5728\u8bbe\u8ba1\u4e0a\u575a\u6301\u4e86\u6e05\u6670\u5212\u4e00\u7684\u98ce\u683c\uff0c\u8fd9\u4f7f\u5f97Python\u6210\u4e3a\u4e00\u95e8\u6613\u8bfb\u3001\u6613\u7ef4\u62a4\uff0c\u5e76\u4e14\u88ab\u5927\u91cf\u7528\u6237\u6240\u6b22\u8fce\u7684\u3001\u7528\u9014\u5e7f\u6cdb\u7684\u8bed\u8a00\u3002
\u6269\u5c55\u8d44\u6599\uff1a
python\u53c2\u8003\u51fd\u6570
chr(i)\u628a\u4e00\u4e2aASCII\u6570\u503c,\u53d8\u6210\u5b57\u7b26
ord(i)\u628a\u4e00\u4e2a\u5b57\u7b26\u6216\u8005unicode\u5b57\u7b26,\u53d8\u6210ASCII\u6570\u503c
oct(x)\u628a\u6574\u6570x\u53d8\u6210\u516b\u8fdb\u5236\u8868\u793a\u7684\u5b57\u7b26\u4e32
hex(x)\u628a\u6574\u6570x\u53d8\u6210\u5341\u516d\u8fdb\u5236\u8868\u793a\u7684\u5b57\u7b26\u4e32
str(obj)\u5f97\u5230obj\u7684\u5b57\u7b26\u4e32\u63cf\u8ff0
list(seq)\u628a\u4e00\u4e2asequence\u8f6c\u6362\u6210\u4e00\u4e2alist
tuple(seq)\u628a\u4e00\u4e2asequence\u8f6c\u6362\u6210\u4e00\u4e2atuple
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-Python \uff08\u8ba1\u7b97\u673a\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\uff09
import re
f = open('word.txt','r')
word = f.read()
f.close()
# ------- 1 -------
wList1 = []
word1 = word.split(',')
for i in word1:
wList1.append(i.lower())
wLen1 = len(wList1)
print 'number of word:', wLen1, '
', wList1
# ------- 2 -------
wList2 = []
word2 = re.findall('[a-zA-Z]+', word)
for i in word2:
wList2.append(i.lower())
wLen2 = len(wList2)
print '
number of word:', wLen2, '
', wList2
两种方法做的，如果单词之间的符号都一样，直接split('符号')就可以了，若是有不同的符号，就可以用第二种方法中的re库。
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