Question

first of all, sorry for this easy question. I know these questions are really basic. I need to save a txt file in Python 2.7 with several rows. I need to ask some suggestions to improve my basic code.

this is a basic example

file_out = open("..//example//test.text", "w")

for p in range(10):
    ID = str(p)
    A = p*10
    B = p+10
    C = p-10
    D = p+p
    E = p*2
    file_out.write("s% %s %s %s s% s%" % (ID,A,B,C,D,E)+ "\n")
file_out.close()

my question are:

• i have this Error Message, and i did’n find a way to resolve

  Traceback (most recent call last):
  File "<interactive input>", line 1, in <module>
    ValueError: incomplete format
  

• my element to save (ex: ID,A,B,C,D,E) are several (30 elements), and
  i use a long line of s%. IS there an elegant way and compact to code
  this line?.

• i wish to save also an head (ex: ID,A,B,C,D,E). What is the best way
  to do this?

Answer 1

you have a typo

file_out.write("%s %s %s %s %s %s" % (ID,A,B,C,D,E)+ "\n")

or

   file_out.write("%s %s %s %s %s %s\n" % (ID,A,B,C,D,E))

or

file_out.write(" ".join(["%s" %i for i in [A, B, C, D, E]]))