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强烈建议使用上下文管理器。一个优点是，无论发生什么情况，都可以确保文件始终关闭：
with open("Output.txt", "w") as text_file:
text_file.write("Purchase Amount: %s" % TotalAmount)
这是显式版本（但永远记住，上面的上下文管理器版本应该是首选）：
text_file = open("Output.txt", "w")
text_file.write("Purchase Amount: %s" % TotalAmount)
text_file.close()
如果您使用的是Python2.6或更高版本，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
{}{0}在Python3中，
fileprintwith open("Output.txt", "w") as text_file:
print("Purchase Amount: {}".format(TotalAmount), file=text_file)
Python3.6 引入了 f-strings 作为另一种替代方案
with open("Output.txt", "w") as text_file:
print(f"Purchase Amount: {TotalAmount}", file=text_file)
如果您想传递多个参数，您可以使用元组
price = 33.3
with open("Output.txt", "w") as text_file:
text_file.write("Purchase Amount: %s price %f" % (TotalAmount, price))
如果您使用的是Python3。
然后你就可以使用打印功能 :
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()
使用pathlib模块，不需要缩进。
import pathlib
pathlib.Path("output.txt").write_text("Purchase Amount: {}" .format(TotalAmount))
从 python 3.6 开始，f 字符串可用。
pathlib.Path("output.txt").write_text(f"Purchase Amount: {TotalAmount}")
如果您使用 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')
我猜很多人使用这里的答案作为如何将字符串写入文件的一般快速参考。通常，当我将字符串写入文件时，我想指定文件编码，具体操作方法如下：
with open('Output.txt', 'w', encoding='utf-8') as f:
f.write(f'Purchase Amount: {TotalAmount}')
如果不指定编码，则使用的编码与平台相关 （请参阅文档）。我认为从实际角度来看，默认行为很少有用，并且可能会导致严重的问题。这就是为什么我几乎总是设置
encoding使用
f-stringmultiple parametersstr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')
如果您需要将长 HTML 字符串拆分为较小的字符串，并将它们添加到由新行
.txt\n""''#decide the character number for every division
divideEvery = 100
myHtmlString = "<!DOCTYPE html><html lang='en'><title>W3.CSS Template</title><meta charset='UTF-8'><meta name='viewport' content='width=device-width, initial-scale=1'><link rel='stylesheet' href='https://www.w3schools.com/w3css/4/w3.css'><link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Lato'><link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css'><style>body {font-family: 'Lato', sans-serif}.mySlides {display: none}</style><body></body></html>"
myLength = len(myHtmlString)
division = myLength/divideEvery
print("number of divisions")
print(division)
carry = myLength%divideEvery
print("characters in the last piece of string")
print(carry)
f = open("result.txt","w+")
f.write("Below the string splitted \r\n")
f.close()
x=myHtmlString
n=divideEvery
myArray=[]
for i in range(0,len(x),n):
myArray.append(x[i:i+n])
#print(myArray)
for item in myArray:
f = open('result.txt', 'a')
f.write('server.sendContent(\"'+item+'\");' '\n'+ '\n')
f.close()