python 文件查找及截取字符串 (替换，分割) demo

#"F:\test.txt"

'''
# 例1：字符串截取
str = '12345678'
print str[0:1]


# 例2：字符串替换
str = 'akakak'
str = str.replace('k',' 8')    # 将字符串里的k全部替换为8

# 例3：字符串查找
str = 'a,hello'
print str.find('hello')    # 在字符串str里查找字符串hello
>> 2            # 输出结果

例4：字符分割
str = 'a,b,c,d'
strlist = str.split(',')    # 用逗号分割str字符串，并保存到列表
for value in strlist:    # 循环输出列表值
    print value
>> a            # 输出结果
>> b
>> c
>> d

'''
data = ''
with open('F:\test.txt', 'r') as f:
  for line in f.readlines():
    line = line.strip()
    #print(line)
    idx = line.find("orderNo")
    if(idx != -1):
        print(line[idx+9:idx+26])
    data += line