Question

当前节目：

#!/usr/bin/python

lookup = 'Loop time'

with open('log.lammps') as myFile:
    found = []
    for num, line in enumerate(myFile, 1):
        if lookup in line:
            print 'found at line:', num
            found.append(num)
print found
  a = int(found[0])
  b = int(found[1])
  c = int(found[2])
  d = int(found[3])

lookup = 'Memory usage per processor ='

with open('log.lammps') as myFile:
    found2 = []
    for num, line in enumerate(myFile, 1):
        if lookup in line:
           print 'found at line:', num
            found2.append(num)
print found2
e = int(found2[0])
f = int(found2[1])
g = int(found2[2])
h = int(found2[3])

x = 0
while x < len(found):
    a = found[x]
    e = found2[x]

    print "Some thing useful!"

    for w,line in enumerate(open("log.lammps")):
        if w >= e and w < a :
           print line,
           x += 1

如何将最后一个while函数存储到文档中。我希望它用这个程序打印出的数据创建一个文件，这样我就可以让matlab读取该文件了。

Answer 1

最简单的解决方案是将输出重定向到文件。让script.py成为你的python脚本：

./script.py > out.txt

否则，您可以直接在python中将stdout重定向到文件。

#!/usr/bin/python

import sys
sys.stdout = open('out.txt', 'w')

lookup = 'Loop time'
...

现在每个print语句都会重定向到out.txt

Answer 2

一种非常快捷的方法是用开放文件描述符替换sys.stdout。

f = open("file.txt","w")
old_stdout = sys.stdout
sys.stdout = f

while x < len(found):
    a = found[x]
    e = found2[x]

    print "Some thing useful!"

    for w,line in enumerate(open("log.lammps")):
        if w >= e and w < a :
           print line,
           x += 1

sys.stdout = old_stdout
f.close()

这会自动将您打印的所有内容重定向到file.txt而不是stdout。不过，它也有点像个hackish。最好只打开写文件，然后用print ...替换f.write(...)，因为你没有任何复杂打印功能。

（我假设您只想将最后一个while循环写入文件，正如您的问题所述。）

Answer 3

在开始时打开文件并随时写入数据：

with open('output.txt',"w") as out:

无论您在何处打印数据，只需将其写入文件：

    print 'found at line:  {}'.format(num) 
    out.write('found at line:  {}\n'.format(num)) etc..

只需启动您的代码：

with open('output.txt',"w") as out:
    with open('log.lammps') as myFile:
       # continue with your code

Answer 4

关于sys.stdout的重要一点是，您必须import sys而不是from sys import stdout

即。赢了将输出重定向到文件：

>>> from sys import stdout
>>> stdout = open('/dev/null', 'w')
>>> print 1
1  # not working

如何使它将所有打印的内容存储在一个文件中

4 个答案: