sys.displayhook code example

Example 1: python sys

import sys
print('Python version you are using')
print(sys.version)
print('Informantion')
print(sys.version_info)

Example 2: sys.displayhook

import sys

class ExpressionCounter(object):

    def __init__(self):
        self.count = 0
        self.previous_value = self

    def __call__(self, value):
        print
        print '  Previous:', self.previous_value
        print '  New     :', value
        print
        if value != self.previous_value:
            self.count += 1
            sys.ps1 = '(%3d)> ' % self.count
        self.previous_value = value
        sys.__displayhook__(value)

print 'installing'
sys.displayhook = ExpressionCounter()

Example 3: sys python

def displayhook(value):
    if value is None:
        return
    # Set '_' to None to avoid recursion
    builtins._ = None
    text = repr(value)
    try:
        sys.stdout.write(text)
    except UnicodeEncodeError:
        bytes = text.encode(sys.stdout.encoding, 'backslashreplace')
        if hasattr(sys.stdout, 'buffer'):
            sys.stdout.buffer.write(bytes)
        else:
            text = bytes.decode(sys.stdout.encoding, 'strict')
            sys.stdout.write(text)
    sys.stdout.write("\n")
    builtins._ = value