python 中提取以指定字符开头、结尾的数据

 

1、测试数据

root@PC1:/home/test2# cat a.txt
d u s
x e j
z c e
e f a
z x e
w f e

 

2、提取以z开头的数据

root@PC1:/home/test2# ls
a.txt  test.py
root@PC1:/home/test2# cat a.txt
d u s
x e j
z c e
e f a
z x e
w f e
root@PC1:/home/test2# cat test.py      ##  提取以z开头的数据
#!/usr/bin/python

in_file = open("a.txt", "r")
out_file = open("result.txt", "w")
lines =  in_file.readlines()

for i in lines:
    if i.startswith("z"):
        out_file.write(i)

in_file.close()
out_file.close()
root@PC1:/home/test2# python test.py
root@PC1:/home/test2# ls
a.txt  result.txt  test.py
root@PC1:/home/test2# cat result.txt     ## 查看结果
z c e
z x e

 

3、同时提取以z和x开头的数据

root@PC1:/home/test2# ls
a.txt  test.py
root@PC1:/home/test2# cat a.txt
d u s
x e j
z c e
e f a
z x e
w f e
root@PC1:/home/test2# cat test.py   ## 提取以z开头或者以x开头的数据
#!/usr/bin/python

in_file = open("a.txt", "r")
out_file = open("result.txt", "w")

lines = in_file.readlines()

for i in lines:
    if (i.startswith("z")) or (i.startswith("x")):
        out_file.write(i)

in_file.close()
out_file.close()
root@PC1:/home/test2# python test.py
root@PC1:/home/test2# ls
a.txt  result.txt  test.py
root@PC1:/home/test2# cat result.txt     ## 查看结果
x e j
z c e
z x e

 

4、提取以e结尾的数据

root@PC1:/home/test2# ls
a.txt  test.py
root@PC1:/home/test2# cat a.txt
d u s
x e j
z c e
e f a
z x e
w f e
root@PC1:/home/test2# cat test.py       ## 提取以e结尾的数据
#/usr/bin/python

in_file = open("a.txt", "r")
out_file = open("result.txt", "w")

lines = in_file.readlines()

for i in lines:
    if i.endswith("e\n"):
        out_file.write(i)

in_file.close()
out_file.close()
root@PC1:/home/test2# python test.py
root@PC1:/home/test2# ls
a.txt  result.txt  test.py
root@PC1:/home/test2# cat result.txt         ##  查看结果
z c e
z x e
w f e

 

5、同时提取以e结尾或者j结尾的数据

root@PC1:/home/test2# ls
a.txt  test.py
root@PC1:/home/test2# cat a.txt
d u s
x e j
z c e
e f a
z x e
w f e
root@PC1:/home/test2# cat test.py          ## 同时提取以e结尾或者以j结尾的数据
#/usr/bin/python

in_file = open("a.txt", "r")
out_file = open("result.txt", "w")

lines = in_file.readlines()

for i in lines:
    if (i.endswith("e\n")) or (i.endswith("j\n")):
        out_file.write(i)

in_file.close()
out_file.close()
root@PC1:/home/test2# python test.py
root@PC1:/home/test2# ls
a.txt  result.txt  test.py
root@PC1:/home/test2# cat result.txt         ## 查看结果
x e j
z c e
z x e
w f e

 

6、提取以z开头且以e结尾的数据

root@PC1:/home/test2# ls
a.txt  test.py
root@PC1:/home/test2# cat a.txt
z u s
x e j
z c e
e f a
z x e
w f e
root@PC1:/home/test2# cat test.py    ## 提取以z开头，且以e结尾的数据
#/usr/bin/python

in_file = open("a.txt", "r")
out_file = open("result.txt", "w")

lines = in_file.readlines()

for i in lines:
    if (i.startswith("z")) and (i.endswith("e\n")):
        out_file.write(i)

in_file.close()
out_file.close()
root@PC1:/home/test2# python test.py
root@PC1:/home/test2# ls
a.txt  result.txt  test.py
root@PC1:/home/test2# cat result.txt    ## 查看结果
z c e
z x e