Question

我有一个讨厌的输出文件：

*** Warning: OpenMpAssembler::assemble_interior_facets is untested.
*** Warning: Form::coloring does not properly consider form type.
Coloring mesh.
*** Warning: Form::coloring does not properly consider form type.
Coloring mesh.
*** Warning: Form::coloring does not properly consider form type.
Solving linear system of size 108360 x 108360 (PETSc Krylov solver).
Solving linear system of size 36120 x 36120 (PETSc Krylov solver).
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
   0/240 +0.000000e+00 -1.146247e-08 +0.000000e+00 +1.913417e-03 +0.000000e+00     +0.000000e+00
*** Warning: OpenMpAssembler::assemble_interior_facets is untested.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
Solving linear system of size 108360 x 108360 (PETSc Krylov solver).
Solving linear system of size 36120 x 36120 (PETSc Krylov solver).
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
   1/240 +5.000000e-05 -2.024630e-08 -3.666293e-08 +1.913417e-03 +1.073840e-10    +3.479053e-21
*** Warning: OpenMpAssembler::assemble_interior_facets is untested.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
Solving linear system of size 108360 x 108360 (PETSc Krylov solver).
Solving linear system of size 36120 x 36120 (PETSc Krylov solver).
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
*** Warning: Form::coloring does not properly consider form type.
   2/240 +1.000000e-04 -3.529024e-08 -3.825476e-08 +1.913417e-03 +1.077877e-10 +2.308941e-20

列表继续，我只想提取

0/240 +0.000000e+00 -1.146247e-08 +0.000000e+00 +1.913417e-03 +0.000000e+00 +0.000000e+00
1/240 +5.000000e-05 -2.024630e-08 -3.666293e-08 +1.913417e-03 +1.073840e-10 +3.479053e-21
2/240 +1.000000e-04 -3.529024e-08 -3.825476e-08 +1.913417e-03 +1.077877e-10 +2.308941e-20

我如何用Python做到这一点？基本上我想忽略以 * ，着色和解决

开头的行

Answer 1

startswith方法可以帮助您：

str 。以开头<（em>前缀 [，开始 [，结束] ]）
如果字符串以前缀开头，则返回True，否则返回False。前缀也可以是元组要查找的前缀。使用可选的start，测试字符串从那个位置。使用可选的结尾，停止比较字符串位置。

以下示例代码显示了文本文件行的循环，仅打印那些不以“***”和“Solving”开头的代码：

for l in open("myfile.txt").readlines():
  if not l.startswith("***") and not l.startswith("Solving"): print(l)

Answer 2

f=open('annoying.txt','r')
input_stream=f.read()
output_stream=""
input_stream_lines=input_stream.split("\n")
for line in input_stream_lines:
    if "***" in line or "Solving" in line or "Coloring" in line:
            pass
    else:
            output_stream=output_stream+line+"\n"
g=open('output.txt','w')
g.write(output_stream)

假设您的文本位于名为annoying.txt的文件中，并在文件output.txt中输出（已过滤的结果）

修改

if条件可以更改为：

if line.startswith("***") or line.startswith("Solving") or line.startswith("Coloring"):

<强> EDIT2

如果换行符是分隔符，您也可以

input_stream_lines=f.readlines()

Answer 3

with open("input.txt") as f:
    for line in f:
        if not (line.startswith("***") or line.startswith("Solving")):
            print line

Answer 4

如果你只想要一个单行将其过滤到另一个文件中，只需使用grep：

grep -ve "^(Solving\|\*\*\*)" input.txt > output.txt

或者，请查看其他答案指出的startswith。

Answer 5

使用此：

import re
f = open('badfile.txt', 'r')
result = 0
for line in f.readlines():
    r = re.search(r'^\*\*\*|^Solving')
    if r:
        continue
    result += line + '\n'
print result

Answer 6

这看起来像FEniCS输出。您可以通过声明：

来抑制不需要的消息

set_log_level(ERROR)

代码。

Answer 7

import re

with open('log.txt', 'r') as f:
    for line in f:
        if not re.match("^\*\*\*", line):
            print line,

编辑：太慢

Answer 8

你可以这样做：

import re
from itertools import ifilter

with open('/tmp/annoying.txt','r') as f:
     for line in ifilter(lambda x: re.match(r'\s+\d+',x),f):
         print line.strip()

打印：

0/240 +0.000000e+00 -1.146247e-08 +0.000000e+00 +1.913417e-03 +0.000000e+00     +0.000000e+00
1/240 +5.000000e-05 -2.024630e-08 -3.666293e-08 +1.913417e-03 +1.073840e-10    +3.479053e-21
2/240 +1.000000e-04 -3.529024e-08 -3.825476e-08 +1.913417e-03 +1.077877e-10 +2.308941e-20

使用Python删除文本文件中以特定字符开头的行

8 个答案: