标签:style blog http color os ar for strong 文件
1、strip函数
theString = ‘ abcdbcyesornoabcbacdd ‘ print theString.strip()
abcdbcyesornoabcbacdd
theString = ‘abcdbcyesornoabcbacdd‘ print theString.strip(‘abcd‘) #去掉两端的abcd字符 yesorno
问题:如何去掉中间空格。
theString = ‘ hello python ‘
s = ‘ hello python ‘ strList = s.split() print "".join(strList) hellopython
2、split
切割字符串对象为列表。
s = ‘age:13, name:chen, grade:70‘ strList = s.split(‘,‘) print strList [‘age:13‘, ‘ name:chen‘, ‘ grade:70‘]
3、join 字符串连接函数
s = [‘a‘, ‘b‘, ‘c‘, ‘d‘] print ‘‘.join(s) print ‘-‘.join(s) abcd a-b-c-d
4、字符串倒转
s = ‘python‘ print s[::-1] l = list(s) l.reverse() print l#‘‘.join(l) #注意reverse函数返回值是一个列表 print ‘‘.join(l) nohtyp [‘n‘, ‘o‘, ‘h‘, ‘t‘, ‘y‘, ‘p‘] nohtyp
5、读入文件中的数据(readlines())
fr = open(filename)
numberOfLines = len(fr.readlines()) #get the number of lines in the file
returnMat = zeros((numberOfLines,3)) #prepare matrix to return
classLabelVector = [] #prepare labels return
index = 0
for line in fr.readlines():
line = line.strip()
listFromLine = line.split(‘\t‘)
returnMat[index,:] = listFromLine[0:3]
classLabelVector.append(int(listFromLine[-1]))
index += 1
fr = open(filename) data=[inst.strip().split(‘\t‘) for inst in fr.readlins()]
2014-10-12
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本文链接地址:python字符串处理与文件操作
标签:style blog http color os ar for strong 文件
原文地址:http://www.cnblogs.com/ddblog/p/4020839.html