print: Tips and tricks

[microphone_head]

Hi all.

I found that when I run the print command with "\b" I can produce a tick symbol.

Does anyone have any other tips they would like to share about this function?

print("Microphone_Head ", end ="") ; print("is in the house \b")

Output:
Microphone_Head is in the house 

PS. I'm running Python on a RaspberyPi 2B+, and there really is a tick symbol honest .

[perfringo]

Unless an 'r' or 'R' prefix is present, escape sequences in string and bytes literals are interpreted according to rules similar to those used by Standard C.

Escape sequence \b meaning is "ASCII Backspace (BS)". Other sequences and their meanings are available in Python documentiation (String and Byte Literals)

[Gribouillis]

Try

print(''.join(chr(9812 + x) for x in range(12)))

[perfringo]

Try

print(''.join(chr(9812 + x) for x in range(12)))

King is smaller than pawn

>>> '♔' < '♙'
True

---

Little animation:

import time 
import sys 
 
animation = '|/-\\' 
for i in range(25): 
    time.sleep(0.1) 
    sys.stdout.write(f"\r{animation[i % len(animation)]}")
    sys.stdout.flush() 

[snippsat]

for word in 'f-strings are awesome'.split():
    print(f'{word.capitalize():\N{smiling face with sunglasses}^15}')

[microphone_head]

import time 
import sys 
 
animation = '|/-\\' 
for i in range(25): 
    time.sleep(0.1) 
    sys.stdout.write(f"\r{animation[i % len(animation)]}")
    sys.stdout.flush() 

Do I need to import another library?

I've tried running this in Python 2.7.9 and Python 3.4.2 and I cant't get it to work. It reports a syntax error on the following line:

sys.stdout.write(f"\r{animation[i % len(animation)]}")

FYI. I'm running the Python on a Raspberry Pi 2B+.

---

Unless an 'r' or 'R' prefix is present, escape sequences in string and bytes literals are interpreted according to rules similar to those used by Standard C.

Escape sequence \b meaning is "ASCII Backspace (BS)". Other sequences and their meanings are available in Python documentiation (String and Byte Literals)

Hi perfringo,

I don't understand what you mean. I've had a quick read of the link you gave . I tried the following:

print("MH\rb")
print("MH\Rb")

and got

Output:
MH
b
MH\Rb

I was toying with the idea of being able to write some chars to the Python shell before deleting it to make a progress bar. Can you give an example ?

[snippsat]

I've tried running this in Python 2.7.9 and Python 3.4.2 and I cant't get it to work. It reports a syntax error on the following line:

Upgrade your python version,f-string was new in Python 3.6.
Like this it will work in older version.

import time
import sys

animation = '|/-\\'
for i in range(25):
    time.sleep(0.1)
    sys.stdout.write("\r{}".format(animation[i % len(animation)]))
    sys.stdout.flush()

[perfringo]

Do I need to import another library?

I've tried running this in Python 2.7.9 and Python 3.4.2 and I cant't get it to work.
FYI. I'm running the Python on a Raspberry Pi 2B+.

This code uses f-strings available from Python >= 3.6. If you replace this with following, it should work:

sys.stdout.write("\r" + animation[i % len(animation)])

ninjad by snippsat

[microphone_head]

I've tried running this in Python 2.7.9 and Python 3.4.2 and I cant't get it to work. It reports a syntax error on the following line:

Upgrade your python version,f-string was new in Python 3.6. Like this it will work in older version.

import time import sys animation = '|/-\\' for i in range(25): time.sleep(0.1) sys.stdout.write("\r{}".format(animation[i % len(animation)])) sys.stdout.flush()

Ok, it runs but this is the output on my machine:

Output:
|
/
-
\
|
/
-
\
|
/
-
\
|
/
-
\
|
/
-
\
|
/
-
\
|

Something weird is going on. When I copied the output from my shell window it all appeared on one line, like a list of musical notes. But it does run.

[perfringo]

I was toying with the idea of being able to write some chars to the Python shell before deleting it to make a progress bar. Can you give an example ?

Something along those lines (no f-strings, should work right away)?

import sys, time

def status_bar(activity, progres):
    length = 25                         
    block = int(round(length*progres))
    msg = "\r{0}: [{1}] {2}%".format(activity, "#"*block + "-"*(length-block), round(progres*100, 2))
    if progres >= 1: 
        msg += " Ready\r\n"
    sys.stdout.write(msg)
    sys.stdout.flush()



# usage
for i in range(100):
    time.sleep(0.1)
    status_bar('Activity', i/100.0)
status_bar('Activity', 1)