Text parsing 在python中删除以octothorpe开头的列表元素会忽略一些元素
这是文本文件(pathProtocol.txt): 我正在解析并试图从中删除空格和以#开头的行。 使用我的代码从以下内容开始:Text parsing 在python中删除以octothorpe开头的列表元素会忽略一些元素,text-parsing,python-3.7,Text Parsing,Python 3.7,这是文本文件(pathProtocol.txt): 我正在解析并试图从中删除空格和以#开头的行。 使用我的代码从以下内容开始: # 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 =
# 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
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']
这会从初始列表中省略某些项,但会在随后的列表输出中显示它们。作为一名python初学者,我无法理解逐行输出中发生的事情。我犯了什么错误?如何正确删除以#?开头的行?当您在内容上进行迭代时,您正在更改内容,这通常不起作用。 相反,在
内容的副本上迭代。也就是说,将enumerate(content)
更改为enumerate(content[:])
# DELETE COMMENTS
for i, line in enumerate(content):
print(str(i), line, '\tfirst char:', line[0])
if line.startswith('#'):
content.remove(line)
#
#
print(content)
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']