在python中删除以octothorpe开头的列表元素会省略一些元素

时间:2019-02-01 16:20:09

标签: text-parsing python-3.7

这是文本文件(pathProtocol.txt):

# 2018-09-30
# incubator at 33C
# sample compartment at 32C
# hold sample in for 30sec before
# measurement

samp-2
reps-3

#Temp   Humid   Press
# 24    42  980

# background
MilliQ_MilliQ_0 000-005

Q_Prp_62mM  006-011
Q_Ah6_62mM  012-017
Q_Eth_62mM  018-023
Q_AcA_62mM  024-029
Q_Imd_62mM  030-035

# background
MilliQ_MilliQ_0 036-041
# 24    43  977

我正在解析,并试图从中删除以#开头的空格和行。 使用this answer,我的代码开始于:

# PROTOCOL PARSING
# READ FILE & EXCLUDE BLANKS
with open(os.path.join(*pathProtocol)) as f:
    content = (line.rstrip() for line in f)
    # Non-blank lines in a list
    content = list(line for line in content if line)
#
print(content)
print(type(content))
print(len(content))
print('')

产生所需的输出:

['# 2018-09-30', '# incubator at 33C', '# sample compartment at 32C', '# hold sample in for 30sec before', '# measurement', 'samp-2', 'reps-3', '#Temp   Humid\tPress', '# 24\t42\t980', '# background', 'MilliQ_MilliQ_0\t000-005', 'Q_Prp_62mM\t006-011', 'Q_Ah6_62mM\t012-017', 'Q_Eth_62mM\t018-023', 'Q_AcA_62mM\t024-029', 'Q_Imd_62mM\t030-035', '# background', 'MilliQ_MilliQ_0\t036-041', '# 24\t43\t977']
<class 'list'>
19

当我尝试从上述创建的列表(this answer)中删除以八倍体开头的行时,有趣的部分开始了:

# DELETE COMMENTS
for i, line in enumerate(content):
    print(str(i), line, '\tfirst char:', line[0])
    if line.startswith('#'):
        content.remove(line)
    #
#
print(content)

我得到以下输出:

0 # 2018-09-30  first char: #
1 # sample compartment at 32C   first char: #
2 # measurement     first char: #
3 reps-3    first char: r
4 #Temp   Humid Press   first char: #
5 # background  first char: #
6 Q_Prp_62mM    006-011     first char: Q
7 Q_Ah6_62mM    012-017     first char: Q
8 Q_Eth_62mM    018-023     first char: Q
9 Q_AcA_62mM    024-029     first char: Q
10 Q_Imd_62mM   030-035     first char: Q
11 # background     first char: #
12 # 24 43  977     first char: #
['# incubator at 33C', '# hold sample in for 30sec before', 'samp-2', 'reps-3', '# 24\t42\t980', 'MilliQ_MilliQ_0\t000-005', 'Q_Prp_62mM\t006-011', 'Q_Ah6_62mM\t012-017', 'Q_Eth_62mM\t018-023', 'Q_AcA_62mM\t024-029', 'Q_Imd_62mM\t030-035', 'MilliQ_MilliQ_0\t036-041']

会忽略初始列表中的某些项目,但会在后续列表输出中显示它们。我只是无法绕过逐行输出的内容(作为python初学者)。我正在犯什么错误?如何正确删除以#开头的行?

1 个答案:

答案 0 :(得分:1)

您正在遍历content的过程中对其进行更改,通常这是行不通的。 而是迭代content副本。也就是说,将enumerate(content)更改为enumerate(content[:])