使用python從幾個.txt文件中連接行？

Question

我在 Windows 10 上使用 python 3.6，我有一項任務是從 1.txt 獲取數據並將它們與一些字符串連接起來，然后將結果放在 2.txt 文件中。

這是我的代碼：

full_url = "https://mysite/images/pic_person/small/"

#file read from
pic_name = open("test.txt","r")
#file write to it 
full_name = open("full_name.txt","a")
while True:
    line = pic_name.readline()
    link = line+full_url
    print(link)
    full_name.write(link)
    if ("" == line):
        print("file finished")
        break;
pic_name.close()
full_name.close()

執行代碼后，它給了我這個結果：

 p100003.jpg https://mysite/images/pic_person/small/p100026.jpg https://mysite/images/pic_person/small/p100951.jpg https://mysite/images/pic_person/small/p100970.jpg https://mysite/images/pic_person/small/p101144.jpghttps://mysite/images/pic_person/small/https://mysite/images/pic_person/small/

除了結果將是這樣的：

 https://mysite/images/pic_person/small/p100026.jpg https://mysite/images/pic_person/small/p100951.jpg https://mysite/images/pic_person/small/p100970.jpg https://mysite/images/pic_person/small/p101144.jpg

文件 test.txt 包含以下幾行：

p100026.jpg
p100951.jpg
p100970.jpg
p101144.jpg

Answer 1

要在底部附加文件，您需要在打開的文件中使用 'a' 標志並將“\\n”作為輸入

full_url = "https://mysite/images/pic_person/small/"

# file read from test.txt
f = open("test.txt", "r")

# iterating each file on pict and write it
with open("text2.txt", "a") as file_object:
    for item in f:
        file_object.write(full_url+item.splitlines()[0]+"\n")

f.close()

Answer 2

你可以更換線

full_name.write(link)

和

full_name.writeline(link)

或者，您可以自己編寫“換行符”（將其視為模擬按 Enter）

full_name.write(link + '\r\n')

Answer 3

你可以使用這個方法

full_url = "https://mysite/images/pic_person/small/"

with open("test.txt") as pic_name:
    links = [full_url + line.rstrip() for line in pic_name]
    
    with open("full_name.txt","w") as name:
        name.write("\n".join(links))

或者

with open("test.txt") as pic_name:
    with open("full_name.txt","a") as name:
        for line in pic_name:
            name.write(full_url + line.rstrip() + "\n")

full_name.txt輸出

https://mysite/images/pic_person/small/p100026.jpg
https://mysite/images/pic_person/small/p100951.jpg
https://mysite/images/pic_person/small/p100970.jpg
https://mysite/images/pic_person/small/p101144.jpg

Answer 4

• 更喜歡with open(file, mode=["r", "w", "w+"]) as <file_handler>:不是open()和<fhandler>.close() 。 如果發生錯誤，文件流會在with版本中自動關閉with而在后一個版本中則不會。 所以with更安全和健壯。
• 在文件處理程序上使用for循環 - 然后不需要對文件結尾 ( eof ) 進行顯式測試。 它逐行讀取。 您的line == ""測試對於這種情況可能沒問題 - 但對於另一種情況可能不行。 使用 for 循環是更通用的解決方案。 此外——更重要的是——內存在任何時間點都只被fin文件的一行占用。 所以內存占用很小。

所以這個問題最pythonic的方法是：

infile = "test.txt"
outfile = "full_name.txt"
full_url = "https://mysite/images/pic_person/small/"

with open(infile, "r") as fin:
    with open(outfile, "a") as fout:
        for line in fin:
            fout.write(full_url + line + "\n")
            # or: print(full_url + line, end="\n", file=fout)

如果您希望像示例中那樣詳細打印，請執行以下操作：

infile = "test.txt"
outfile = "full_name.txt"
full_url = "https://mysite/images/pic_person/small/"

with open(infile, "r") as fin:
    with open(outfile, "a") as fout:
        for line in fin:
            result_line = full_url + line
            fout.writeline(result_line)
            print(result_line)
print("file finished")

Answer 5

你可以試試這個。

full_url = "https://mysite/images/pic_person/small/"

outfile = "fullname.txt"
infile = "test.txt"

with open(outfile, "a") as w:
    with open(infile, "r") as r:
        for line in r:  # read each line in the input file
            w.write(f"{full_url}{line}")  # write to output file

輸入文件，test.txt

p100026.jpg
p100951.jpg
p100970.jpg
p101144.jpg

輸出文件 fullname.txt

https://mysite/images/pic_person/small/p100026.jpg
https://mysite/images/pic_person/small/p100951.jpg
https://mysite/images/pic_person/small/p100970.jpg
https://mysite/images/pic_person/small/p101144.jpg