Not all arguments were converted during string formatting. What does that mean?

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f=open("arquivo.txt", 'w')

I’m making a code to plot a Gaussian on the random walker (Statistical Mechanic) and is giving this error when saving in the file my "Count". That is the code:

for j in range (0,t):
    count=0
    for i in range (0,100):
        x[i]=randint(0,1)
        if x[i]==1:
            count=count+1
            f.write=('0.1f\n'%(count))
f.close()

That is the mistake: 

File "estat", line 23, in <module>
    f.write=('0.1f\n'%(count))
TypeError: not all arguments converted during string formatting

What can it be?

python

  • Please post the entire code for further verification.

  • Python is not my area, but you have tried to convert its variable count for string? The problem may be this, try so f.write=('0.1f\n'%(str(count)))

2 answers

2

Missing one % before the 0.1f. The = there is also unnecessary and would give problem. Do:

f.write('%0.1f\n'%(count))

Or with format:

f.write('{:.1f}\n'.format(count))

2

As Pedro said, its syntax has several errors. The error quoted is because you used the operator % in string, which is used for formatting, but its string does not have any template to be replaced. It is a string literal - and is the absence of % preceding the value 0.1f what causes this.

In addition, the = after the f.write will cause you to overwrite the object instead of calling it - which would not necessarily give error, but would not generate the expected result, for sure.

If you are using Python 3.6 or higher, you can use f-string:

f.write(f'{count:.1f}\n')

I talked a little bit about it here:

I also think it’s useful for you to read about contextual managers to use next to with.

So an alternative to your code would be:

with open('arquivo.txt', 'w') as f:
    for j in range (0, t):
        count = 0
        for i in range(0, 100):
            x[i] = randint(0, 1)
            if x[i] == 1:
                count = count + 1
                f.write(f'{count:.1f}\n')

This is because you can’t know exactly what the other variables are. For example, count will be an entire number, so you really need to format it as floating point?

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