python 字符串处理函数（二）

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string = 'hellO BoWeiFeng'

# 0. 字串长度：len(string)

print '%s length=%d' % (string,len(string))

# 3. 字符串查找相关

  # 搜索指定字符串，没有返回-1：string.find('e')

  # 指定起始位置搜索：string.find('e',start)

  # 指定起始及结束位置搜索：string.find('e',start,end)

  # 从右边开始查找：string.rfind('e')

  # 统计搜到多少个指定字符串：string.count('e')

print '%s find llo=%d' % (string,string.find('llo'))

print '%s find e=%d' % (string,string.find('e'))

print '%s find e from %d=%d' % (string,1,string.find('e',1))

print '%s find e from %d to %d=%d' % (string,1,2,string.find('e',1,2))

print '%s rfind e=%d' % (string,string.rfind('e'))

print '%s count e=%d' % (string,string.count('e'))

  # 上面所有方法都可用index代替，不同的是使用index查找不到会抛异常，而find返回-1

print '%s index llo ' % (string,string.index('llo',1,2))

# 4. 字符串替换相关

  # 替换old为new：string.replace('old','new')

  # 替换指定次数的old为new：string.replace('old','new',maxReplaceTimes)

print '%s replace t to *=%s' % (string,string.replace('e', '*'))

print '%s replace t to *=%s' % (string,string.replace('e', '*',1))

  # 字符串去空格 及去指定字符

    # 去两边空格：string.strip()

    # 去左空格：string.lstrip()

    # 去右空格：string.rstrip()

    # 去两边字符串：string.strip('d')，相应的也有lstrip，rstrip

string=' python String function '

print '%s strip=%s' % (string,string.strip())

string='python String function'

print '%s strip=%s' % (string,string.strip('d'))

# 5. 按指定字符分割字符串为数组(默认按空格分隔)：string.split(' ')

string='a b c de'

print '%s strip=%s' % (string,string.split())

string='a-b-c-de'

print '%s strip=%s' % (string,string.split('-'))

# 6. 字符串判断

  # 是否以start开头：string.startswith('start')

  # 是否以end结尾：string.endswith('end')

  # 是否全为字母或数字：string.isalnum()

  # 是否全字母：string.isalpha()

  # 是否全数字：string.isdigit()

  # 是否全小写：string.islower()

  # 是否全大写：string.isupper()

string='python String function'

print '%s startwith t=%s' % (string,string.startswith('t'))

print '%s endwith d=%s' % (string,string.endswith('d'))

print '%s isalnum=%s' % (string,string.isalnum())

string='pythonStringfunction'

print '%s isalnum=%s' % (string,string.isalnum())

print '%s isalpha=%s' % (string,string.isalpha())

print '%s isupper=%s' % (string,string.isupper())

print '%s islower=%s' % (string,string.islower())

print '%s isdigit=%s' % (string,string.isdigit())

string='5123'

print '%s isdigit=%s' % (string,string.isdigit())