Question

我正在使用Python打开文本文档：

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

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

text_file.close()

我想将字符串变量TotalAmount的值替换为文本文档。有人可以告诉我怎么做吗？

Answer 1

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

如果您使用上下文管理器，则会自动关闭该文件

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，则最好使用str.format()

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，您可以使用{}代替{0}

在Python3中，file函数

有一个可选的print参数

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

Python3.6为另一个替代

引入了f-strings

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

Answer 2

如果您想传递多个参数，可以使用元组

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

更多：Print multiple arguments in python

Answer 3

如果您使用的是Python3。

然后您可以使用Print Function：

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

对于python2

这是Python打印字符串到文本文件的示例

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()

Answer 4

如果你正在使用numpy，只需一行即可将单个（或多个）字符串打印到文件中：

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

Answer 5

使用pathlib模块时，不需要缩进。

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

从python 3.6开始，f-strings可用。

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

Answer 6

使用 f-string 是一个不错的选择，因为我们可以将 multiple parameters 放在 str 之类的语法中，

例如：

import datetime

now = datetime.datetime.now()
price = 1200
currency = "INR"

with open("D:\\log.txt","a") as f:
    f.write(f'Product sold at {currency} {price } on {str(now)}\n')

Python打印字符串到文本文件

6 个答案: