Question

我有一个看起来像的文件：

# Grace project file
#
@version 50005
@page size 600, 600
@default linewidth 2.5
@default linestyle 1
@default color 1
@default font 0
@default char size 1.2
@default symbol size 1.2
@g0 on
@target G0.S0
@type xy
 -0.108851E+02  0.127435E-03
 -0.108715E+02  0.127829E-03
 -0.108579E+02  0.128191E-03
 -0.108443E+02  0.128502E-03
 -0.108306E+02  0.128726E-03
 -0.108170E+02  0.128838E-03
 -0.108034E+02  0.128751E-03
&
@target G0.S1
@type xy
 -0.108851E+02  0.472694E-04
 -0.108715E+02  0.474233E-04
 -0.108579E+02  0.475837E-04
 -0.108443E+02  0.477448E-04
 -0.108306E+02  0.479052E-04
 -0.108170E+02  0.480669E-04
 -0.108034E+02  0.482279E-04
&

我试图从@target行读取：

with open(filename, "r") as f:
  q = 0
  for key,group in it.groupby(f,lambda line: line.startswith('@target')):
    x=[];y=[]
    if not key:
        group = list(group)
        group.pop(0)
        group.pop(-1)
        # print(len(group))
        for i in range(len(group)):
          x.append(group[i].split()[0])
          y.append(group[i].split()[1])
        filen[q]=np.array(list(map(list,zip(x,y))),dtype=float)

问题是，它仍然在比赛前读取线条并给出错误：

Traceback (most recent call last):
  File "/home/rudra/splitagr.py", line 47, in <module>
    filen[q]=np.array(list(map(list,zip(x,y))),dtype=float)
ValueError: could not convert string to float: '@page'

我认为groupby会在line.startswith(@target) 之后开始匹配，但后来@page将如何发布，我不知道。如果我在@target行之前手动删除所有内容，则可以正常工作。

请帮助

Answer 1

您可以使用以下内容将文件缩小到仅@target之后的那些行：

pos = 0
with open('filename', 'r') as f:
    lines = f.readlines()
    for idx, line in enumerate(lines):
        if '@target' in line:
            pos = idx + 1
            break
    lines = lines[pos:]

或更简单：

with open('filename', 'r') as f:
    for line in f:
        if '@target' not in line:
            continue
        # Found '@target' rest of logic.

希望有所帮助！

如何在line.startswith之前解除数据

1 个答案: