Python打印字符串到文本文件


Python Print String To Text File

我正在使用python打开文本文档：

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text_file = open("Output.txt","w")

text_file.write("Purchase Amount:" 'TotalAmount')

text_file.close()

我想在文本文档中替换字符串变量TotalAmount的值。有人能告诉我怎么做吗？

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text_file = open("Output.txt","w")
text_file.write("Purchase Amount: %s" % TotalAmount)
text_file.close()

如果使用上下文管理器，文件将自动为您关闭。

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with open("Output.txt","w") as text_file:
    text_file.write("Purchase Amount: %s" % TotalAmount)

如果您使用的是python2.6或更高版本，最好使用str.format()

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with open("Output.txt","w") as text_file:
    text_file.write("Purchase Amount: {0}".format(TotalAmount))

对于python2.7及更高版本，可以使用{}而不是{0}

在python3中，print函数有一个可选的file参数。

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with open("Output.txt","w") as text_file:
    print("Purchase Amount: {}".format(TotalAmount), file=text_file)

python3.6为另一种选择引入了F字符串

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with open("Output.txt","w") as text_file:
    print(f"Purchase Amount: {TotalAmount}", file=text_file)
相关讨论

如果要传递多个参数，可以使用元组

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price = 33.3
with open("Output.txt","w") as text_file:
    text_file.write("Purchase Amount: %s price %f" % (TotalAmount, price))

更多：在python中打印多个参数

相关讨论

如果使用numpy，只需一行即可将单个(或多个)字符串打印到文件：

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numpy.savetxt('Output.txt', ["Purchase Amount: %s" % TotalAmount], fmt='%s')

If you are using Python3.

然后可以使用打印功能：

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your_data = {"Purchase Amount": 'TotalAmount'}
print(your_data,  file=open('D:\log.txt', 'w'))

For python2

这是python打印字符串到文本文件的示例

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def my_func():
   """
    this function return some value
    :return:
   """
    return 25.256


def write_file(data):
   """
    this function write data to file
    :param data:
    :return:
   """
    file_name = r'D:\log.txt'
    with open(file_name, 'w') as x_file:
        x_file.write('{} TotalAmount'.format(data))


def run():
    data = my_func()
    write_file(data)


run()

使用pathlib模块时，不需要缩进。

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import pathlib
pathlib.Path("output.txt").write_text("Purchase Amount: {}" .format(TotalAmount))

从python 3.6开始，提供F字符串。

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pathlib.Path("output.txt").write_text(f"Purchase Amount: {TotalAmount}")