更改文本文件中数字的位置 - Python 中的第一个到第二个第二个到第一个?

Change position of number in text file - first to second second to first in Python?

您好,我有一个问题,我想更改号码位置。第一个数字将是第二个数字,第二个将是第一个,第三个将是第三个,等等。 这是我输入的一小部分

   1   20  135  154  269  288  403  422  537  556  671  690  805  824  939
 958 1073 1092 1207 1226 1341 1360 1475 1494 1609 1628 1743 1762 1877 1896
2011 2030 2145 2164 2279 2298 2413 2432 2547 2566 2681 2700 2815 2834 2949
2968 3083 3102 3217 3236 3351 3370 3485 3504 3619 3638 3753 3772 3887 3906
4021 4040 4155 4174 4289 4308 4423 4442 4557 4576 4691 4710 4825 4844 4959

所以预期的输出将是

  20    1  154  135  288  269 etc

但问题是,当我尝试将我的号码放入列表时,我有类似 double space 或 \n 等的东西 我写这个

my_file = open("PN_input.txt", "r")
content = my_file.read()
content_list = content.split(" ")
my_file.close()
print(content_list)

我得到了类似的东西,所以我无法进入下一步并通过使用例如 for loop

来更改位置
['', '', '', '1', '', '', '20', '', '135', '', '154', '', '269', '', '288', '', '403', '', '422', '', '537', '', '556', '', '671', '', '690', '', '805', '', '824', '', '939\n', '958',

这里有一些可以帮助您入门的内容:


s = """\
   1   20  135  154  269  288  403  422  537  556  671  690  805  824  939
 958 1073 1092 1207 1226 1341 1360 1475 1494 1609 1628 1743 1762 1877 1896
2011 2030 2145 2164 2279 2298 2413 2432 2547 2566 2681 2700 2815 2834 2949
2968 3083 3102 3217 3236 3351 3370 3485 3504 3619 3638 3753 3772 3887 3906
4021 4040 4155 4174 4289 4308 4423 4442 4557 4576 4691 4710 4825 4844 4959
"""

lines = (line.split() for line in s.splitlines())
new_lines = [[line[1], line[0], *line[2:]] for line in lines]

for line in new_lines:
    print(line)

# prints:
# ['20', '1', '135', '154', '269', '288', '403', '422', '537', '556', '671', '690', '805', '824', '939']
# ['1073', '958', '1092', '1207', '1226', '1341', '1360', '1475', '1494', '1609', '1628', '1743', '1762', '1877', '1896']
# ['2030', '2011', '2145', '2164', '2279', '2298', '2413', '2432', '2547', '2566', '2681', '2700', '2815', '2834', '2949']
# ['3083', '2968', '3102', '3217', '3236', '3351', '3370', '3485', '3504', '3619', '3638', '3753', '3772', '3887', '3906']
# ['4040', '4021', '4155', '4174', '4289', '4308', '4423', '4442', '4557', '4576', '4691', '4710', '4825', '4844', '4959']

一种选择是清理列表以便仅保留数字条目,并清理像“939\n”这样的条目:

my_file = open("PN_input.txt", "r")
content = my_file.read()
content_list = content.split(" ")
my_file.close()

new_content_list = []
non_allowed_chars = (' ', '\n', '\t') 
for e in content_list:
    new_string = e
    for character in non_allowed_chars: # replace non-allowed chars for empty string
        new_string = new_string.replace(character, "") 
    if new_string.isalnum(): # checks if string is alphanumeric
        new_content_list.append(new_string)

print(new_content_list)

作为旁注,您应该使用 with 命令打开文件,以便让 python 处理文件的打开和关闭:

with open("PN_input.txt", "r") as my_file:
    content = my_file.read()
    content_list = content.split(" ")

我做到了。这是我的脚本。如果您有一些建议如何更好地编写它,请发表评论。感谢大家的建议。

my_file = open("PN_input.txt", "r")
content = my_file.read()
content_list = content.split()
print(len(content_list))
for i in range(0,400,2):
    var1 = content_list[i]
    var2 = content_list[i+1]
    content_list[i] = var2
    content_list[i+1] = var1
    print(var1)
    print(var2)
    print(content_list[i])
    print(content_list[i+1])    
    if i == 400:
        break;
print(content_list)
my_file.close()

with open('out.txt', 'w') as f:
    for item in content_list:
        f.write("%s " % item)
    f.close

作为我玩弄 pandas...

的一部分
import pandas as pd
from io import StringIO

data = '''\
   1   20  135  154  269  288  403  422  537  556  671  690  805  824  939
 958 1073 1092 1207 1226 1341 1360 1475 1494 1609 1628 1743 1762 1877 1896
2011 2030 2145 2164 2279 2298 2413 2432 2547 2566 2681 2700 2815 2834 2949
2968 3083 3102 3217 3236 3351 3370 3485 3504 3619 3638 3753 3772 3887 3906
4021 4040 4155 4174 4289 4308 4423 4442 4557 4576 4691 4710 4825 4844 4959
'''

cols = 'abcdefghijklmno'
out = list('badcfehgjilknmo')
widths = [4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5]

buff = StringIO()
for w, c in zip(widths, cols):
    buff.write('%*s' % (w, c))
buff.write('\n')
buff.write(data)
buff.seek(0)

df = pd.read_fwf(buff, widths=widths)

swapped = df[out]

buff = StringIO()
swapped.to_string(buff, header=False, index=False)
print(buff.getvalue())

打印出来

   20     1   154   135   288   269   422   403   556   537   690   671   824   805   939
 1073   958  1207  1092  1341  1226  1475  1360  1609  1494  1743  1628  1877  1762  1896
 2030  2011  2164  2145  2298  2279  2432  2413  2566  2547  2700  2681  2834  2815  2949
 3083  2968  3217  3102  3351  3236  3485  3370  3619  3504  3753  3638  3887  3772  3906
 4040  4021  4174  4155  4308  4289  4442  4423  4576  4557  4710  4691  4844  4825  4959