python操作txt文件中数据教程[1]-使用python读写txt文件

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• 原始txt文件
  
  
• 程序实现后结果
  
  

程序实现

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()