程序实现
代码语言：javascript
复制filename = './test/test.txt'
contents = []
DNA_sequence = []
# 打开文本并将所有内容存入contents中
with open(filename, 'r') as f:
for line in f.readlines():
contents.append(line)
f.close()
# 对contents中的内容进行遍历
# 并将需要的数据存到list DNA_sequence中
for content in contents: # 逐行遍历
p = 0 #
for bit in content: # 对每行进行逐字遍历
if bit == " ": # 遇到空格时进行处理
DNA_sequence.append(content[0:p]) # 将content中的0：p字段存入新列表new中，用于写入新的.txt中
break # 处理完一行以后跳出当前循环
else:
p = p 1 # 如果bit不是空格，指针加1
# print(DNA_sequence)
"""
['AAACAAGGAACAAACGCACA', 'AAAGGACACAGTGAGAGACG', 'AGCCATTGTCGAGTCCGTTA', 'GTGGTCACTCCTCGCAAATT', 'TTCAACCATACAGGCCTCGT',
'CAAATGTGAGGATTCGGACG', 'CCGTGGTGAACTGGAGCGTT', 'Sum', 'AAAGGACACAGTGAGAGACG', 'AGCCATTGTCGAGTCCGTTA',
'CCACAACGCTCGAAGGCAAG', 'AAGTACAGCGGGCCAATAGC', 'CAAATGTGAGGATTCGGACG', 'GAGAACGTTGAGTGAGCGTG', 'GATGTTAAGTAGAGCAGAGG',
'Sum', 'AAACAAGGAACAAACGCACA', 'AAAGGACACAGTGAGAGACG', 'CCACAACGCTCGAAGGCAAG', 'AAGTACAGCGGGCCAAGATC',
'CTCAGAAGATCTCGATGGCT', 'AGCCATTGTCGAGTCCGTTA', 'TGCCGCAAACTACACACACG', 'Sum']
"""
# 由于list DNA_sequence中有不需要的字符串"Sum",将其从列表中去除
for var in DNA_sequence:
if var == "Sum":
DNA_sequence.remove(var)
# print(DNA_sequence)
"""
['AAACAAGGAACAAACGCACA', 'AAAGGACACAGTGAGAGACG', 'AGCCATTGTCGAGTCCGTTA', 'GTGGTCACTCCTCGCAAATT', 'TTCAACCATACAGGCCTCGT',
'CAAATGTGAGGATTCGGACG', 'CCGTGGTGAACTGGAGCGTT', 'AAAGGACACAGTGAGAGACG', 'AGCCATTGTCGAGTCCGTTA', 'CCACAACGCTCGAAGGCAAG',
'AAGTACAGCGGGCCAATAGC', 'CAAATGTGAGGATTCGGACG', 'GAGAACGTTGAGTGAGCGTG', 'GATGTTAAGTAGAGCAGAGG', 'AAACAAGGAACAAACGCACA'
, 'AAAGGACACAGTGAGAGACG', 'CCACAACGCTCGAAGGCAAG', 'AAGTACAGCGGGCCAAGATC', 'CTCAGAAGATCTCGATGGCT',
'AGCCATTGTCGAGTCCGTTA', 'TGCCGCAAACTACACACACG']
"""
# 以写的方式打开文件，如果文件不存在，就会自动创建，如果存在就会覆盖原文件
file_write_obj = open("./DNAlog.txt", 'w')
# 将DNA_sequence中的数据写入到DNAlog.txt文件中
for var in DNA_sequence:
file_write_obj.writelines(var)
file_write_obj.writelines('n')
file_write_obj.close()
