my code:
#!/usr/bin/python3
import getopt
import sys
import re
def readfile():
with open("hello.c", "r") as myfile:
data=myfile.read()
print data
readfile()
in file hello.c:
#include <stdio.h>
void main()
{
auto
printf("Hello World!");
}
I try to read file into variable and then printout it... it writes this thing:
} printf("Hello World!");
I know it's probably some stupid error(I'm beginner)..WHY it doesn't print all the file? can you help?
Since both "}" and "printf" are printed, it looks to me like your whole file is being printed, but all on one line - the cursor just returns to the beginning of the current line and overwrites old data with new data.
This might happen if all of the lines in your file end with carriage returns and not newlines. The simplest solution would be to put the newlines where they belong using replace.
#!/usr/bin/python3
import getopt
import sys
import re
def readfile():
with open("hello.c", "r") as myfile:
data=myfile.read().replace("\r", "\n")
print data
readfile()
You could also open the file in universal newlines mode, which converts \r to \n for you. But this behavior is deprecated and will disappear in Python 4.0.
#!/usr/bin/python3
import getopt
import sys
import re
def readfile():
with open("hello.c", "Ur") as myfile:
data=myfile.read()
print data
readfile()
print(repr(data)) to see what is in the file.
for line in file: or lines = file.readlines(). If you're asking "How do I make changes to the file?", you need to read the file into a string or list, make changes to that object, then open the file again in "w" mode and write your data back in.