为什么我不能同时在Python中的文件中写入2个变量

Question

I have this code:

def yaml_processor(period):
    filepath_reg = "../public/log/testing.log.yaml"
    data = yaml_loader(filepath)
    data = data.get(period)
    for team, key in data.iteritems():
        file = open("test.log.yaml", 'w')
        file.write('%team %period\n')
        file.close()
        print(team, period)

It doesn't want to write them file.write('{team}, {period}\\n') , but prints the values perfectly ...

What am I doing wrong here?

Answer 1

You need to learn string formatting .

Try replacing file.write('%team %period\\n') with

file.write('{} {}\n'.format(team, period))

Answer 2

If you're using a recent version of Python (3.6 or later), you can take advantage of f-strings :

with open("test.log.yaml", 'w') as file:
    file.write(f'{team} {period}\n')

Answer 3

You are opening the file in each iteration of the loop which removes the previous values. Just move the open and close statement out of the loop.

def yaml_processor(period):
filepath_reg = "../public/log/testing.log.yaml"
data = yaml_loader(filepath)
data = data.get(period)
file = open("test.log.yaml", 'w')
for team, key in data.iteritems():
    file.write('%team %period\n')
    print(team, period)
file.close()