Python按字母顺序写入.txt

Question

需要帮助无法按字母顺序写入文件

class_name = "class 1.txt"    #adds '.txt' to the end of the file so it can be used to create a file under the name a user specifies
with open(class_name , 'r+') as file:
    name = (name)
    file.write(str(name + " : " )) #writes the information to the file
    file.write(str(score))
    file.write('\n')
    lineList = file.readlines()
    for line in sorted(lineList):
        print(line.rstrip())

Answer 1

您需要调用file.seek来file.seek地设置读/写位置。

看到seek（）函数？ 一些解释。

Answer 2

您应该使用新的（按字母顺序排列）数据覆盖文件。 这比尝试跟踪file.seek调用（以字节为单位，不是行，甚至不是字符！）要容易得多，而且性能也不会明显下降。

with open(class_name, "r") as f:
    lines = f.readlines()

lines.append("{name} : {score}\n".format(name=name, score=score))

with open(class_name, "w") as f:  # re-opening as "w" will blank the file
    for line in sorted(lines):
        f.write(line)