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import os
import subprocess
def handle_cd_command(arg):
"""Handles a `cd` shell command by calling python's os.chdir."""
CD_CMD = 'cd'
tokens = arg.split(CD_CMD + ' ')
directory = tokens[-1] if len(tokens) > 1 else None
if not directory:
return False, "No folder name was provided."
try:
os.chdir(directory)
subprocess.call(['pwd'])
return True, None
except OSError as e:
return False, e.strerror
def format_uptime(uptime_in_seconds):
"""Format number of seconds into human-readable string.
:param uptime_in_seconds: The server uptime in seconds.
:returns: A human-readable string representing the uptime.
>>> uptime = format_uptime('56892')
>>> print(uptime)
15 hours 48 min 12 sec
"""
m, s = divmod(int(uptime_in_seconds), 60)
h, m = divmod(m, 60)
d, h = divmod(h, 24)
uptime_values = []
for value, unit in ((d, 'days'), (h, 'hours'), (m, 'min'), (s, 'sec')):
if value == 0 and not uptime_values:
# Don't include a value/unit if the unit isn't applicable to
# the uptime. E.g. don't do 0 days 0 hours 1 min 30 sec.
continue
elif value == 1 and unit.endswith('s'):
# Remove the "s" if the unit is singular.
unit = unit[:-1]
uptime_values.append('{0} {1}'.format(value, unit))
uptime = ' '.join(uptime_values)
return uptime
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