I'm trying to print strings in one line.
I've found solutions but they don't works with windows correctly.
I have text file contains names and I want to print them like this
name=john then change john to next name and keep name=, I've made this code but didn't work correctly with windows:
op = open('names.txt','r')
print 'name=',
for i in op.readlines():
print '\r'+i.strip('\n')
thank you for your time
Simply using \r won't work in this case, because that returns you to the beginning of the line, so you'll have to reprint the entire line. Also, in some systems (including Windows, I think) Python's print statement (function in 3+) interprets \r as a newline. I believe this code should be system-independent.
import sys, time
with open('names.txt', 'r') as names:
prev_len = 0
for name in names:
sys.stdout.write('\r' + ' ' * prev_len)
sys.stdout.flush()
output_string = '\rname={}'.format(name.strip())
prev_len = len(output_string)
sys.stdout.write(output_string)
sys.stdout.flush()
time.sleep(0.3)
print
You could also use \b, which generally moves the cursor back by one space.
As you pointed out, it's necessary to overwrite the previously printed line with spaces, which means it's necessary to remember the length of the previous line. It makes sense to encapsulate that state in an object, I think. Here's a much cleaner solution than the above that uses that strategy:
import sys, time
class LineUpdater(object):
def __init__(self, outfile=None):
self.prev_len = 0
self.outfile = sys.stdout if outfile is None else outfile
def write(self, line):
line = line.strip()
output = '\r{:<{width}}'.format(line, width=self.prev_len)
self.prev_len = len(line)
self.outfile.write(output)
self.outfile.flush()
with open('names.txt', 'r') as names:
out = LineUpdater()
for name in names:
out.write('name={}'.format(name))
time.sleep(0.3)
print
naaaaaaaaaaaaame then next name would be john the output would be like johnaaaaaaaaaame i've tried your solutions before i post this problem and didn't work with windows
\r is usually used to print lines of equal length. This wouldn't work on any system for your purposes! I'll update.Using '\b' as suggested by senderle
import sys
import time
sys.stdout.write('name=')
last_lenght = 0
with open('names.txt') as names:
for name in names:
sys.stdout.write('\b' * last_lenght) # go back
sys.stdout.write(' ' * last_lenght) # clear last name
sys.stdout.write('\b' * last_lenght) # reposition
sys.stdout.write(name.strip())
sys.stdout.flush()
last_lenght = len(name.strip())
time.sleep(0.5)
