Python 使用带open的print=

我正试图将下面的代码打印到一个文件中。 通过查看堆栈溢出，我发现file=open代码，但它似乎没有写入文件

另外，我还没有创建文件

print("Average Grade " + str(average), "At least 70% " + 
      str(Grade1), "60% - 69% " + str(Grade2), "50% - 59% " +
      str(Grade3), "40% - 49% " + str(Grade4), "Less than 40% " + 
      str(Grade5), "Highest Grade " +
      str(max_grade), "Student Name:" + str(student_name), sep="\n", 
      file=open("results.txt", 'a'))

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请注意，open中的“a”选项用于追加。您还可以使用“w”进行写操作。

在python中，我们通常不使用print语句。考虑下面的备选方案。使用上下文管理器允许您写入多行，并且如果程序在写入文件时抛出错误，也有助于避免某些问题

with open('results.txt', 'a') as f:
    line = "Average Grade " + str(average), "At least 70% " + str(Grade1), "60% - 69% " + str(Grade2), "50% - 59% " + str(Grade3), "40% - 49% " + str(Grade4), "Less than 40% " + str(Grade5), "Highest Grade " + str(max_grade), "Student Name:" + str(student_name)
    f.write(line)

顺便说一句，如果您以交互方式执行此操作，您可能不会立即看到写入文件的数据-这在使用终端而不是运行脚本时可能是一个真正的混淆点！发生的情况是python将数据以大数据块的形式写入文件，而不是在每次调用f.write时都要求硬盘进行工作。刷新输出缓冲区告诉python立即写入数据-例如f.flush

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print语句实际上有一个flush参数，这可能与此高度相关。不过，我还是建议改用with语句。

我让它工作起来了。我打开文件，然后在打印结束时使用file=

newFile = open("results.txt", 'w')

print("Average Grade " + str(average), "At least 70% " + str(Grade1), "60% - 69% " + str(Grade2), "50% - 59% " +
  str(Grade3), "40% - 49% " + str(Grade4), "Less than 40% " + str(Grade5), "Highest Grade " +
  str(max_grade), "Student Name:" + str(student_name), sep="\n", file=newFile)

newFile.close()

试试这个：

file = open("Here you put your path to a file, but replace '\' with '\\'", 'w+')
# That opened your file in 'write' mode, and '+' means that if it does not 
# exist, one will be created
file.write("Average Grade " + str(average), "At least 70% " + 
str(Grade1), "60% - 69% " + str(Grade2), "50% - 59% " +
str(Grade3), "40% - 49% " + str(Grade4), "Less than 40% " + 
str(Grade5), "Highest Grade " +
str(max_grade), "Student Name:" + str(student_name))
file.close()

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打印字符串并不意味着它已写入文件。使用file.writeyourstring实际执行此操作。如果可能的话，使用上下文管理器。你是什么意思？我还是个新手，这是我找到代码的地方。使用文件=。。。打印的参数应该有效。也许您想发布一篇文章，以便读者能够重现您的问题。您的代码适用于我的python 3.6。在程序运行后，您是否正在查看正确目录中的results.txt？

file = open("Here you put your path to a file, but replace '\' with '\\'", 'w+')
# That opened your file in 'write' mode, and '+' means that if it does not 
# exist, one will be created
file.write("Average Grade " + str(average), "At least 70% " + 
str(Grade1), "60% - 69% " + str(Grade2), "50% - 59% " +
str(Grade3), "40% - 49% " + str(Grade4), "Less than 40% " + 
str(Grade5), "Highest Grade " +
str(max_grade), "Student Name:" + str(student_name))
file.close()