Complete the code so it will read strings from a file and then write them to another file. Replace 'FillThisIn' with missing code.

str$\_$list $=[]$

# open DataFile$6.$txt for reading

file$6=$ FillThisIn

# read lines from file$6$

for FillThisIn:

line $=$ line.rstrip$(\text{'}\text{'})$

str$\_$list.append$($line$)$

# close file$6$

FillThisIn

for i in range$($len$($str$\_$list$))$:

str$\_$list$[$i$]=$ str$\_$list$[$i$].$upper$()$

# open DataFile$7.$txt for writing

file$7=$ FillThisIn

# write items in str$\_$list to file$7$

for item in str$\_$list:

FillThisIn

# close file$6$

FillThisIn