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import os
import sys
class TooManyArguments(Exception):
pass
def pwd(args: list, stdin=sys.stdin, stdout=sys.stdout):
if not len(args) == 0:
raise TooManyArguments()
print(os.getcwd(), file=stdout)
def chdir(args: list, stdin=sys.stdin, stdout=sys.stdout):
if len(args) == 0:
os.chdir(os.getenv("HOME"))
elif len(args) == 1:
os.chdir(next(iter(args)))
else:
raise TooManyArguments()
def export(args: list, stdin=sys.stdin, stdout=sys.stdout):
if len(args) == 0:
for key, value in sorted(os.environ.items()):
print(f"{key}={value}", file=stdout)
else:
raise NotImplementedError()
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