How to write a line to text file when particular condition is satisfied

I have a loop and checking one condition as follows

 while (t<len(var)):
        PR=y
        ...
        if z[t]<PR :
              pass_check=1
        else:
              pass_check=0 
      t=t+1

# check z for all samples and print the result

if pass_check==1:
print ('Test is  pass')
elif pass_check==0:
print ('Test is  fail')
else:
print ('Test is  fail')

Goal

How to write Test is pass or fail in a text file depending upon the condition if all samples are 1 or 0 respectively