what's the meaning of %r in python

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what's the meaning of %r in the following statement?

print '%r' % (1)

I think I've heard of %s, %d, and %f but never heard of this.

Background:

In Python, there are two builtin functions for turning an object into a string: str vs. repr. str is supposed to be a friendly, human readable string. repr is supposed to include detailed information about an object's contents (sometimes, they'll return the same thing, such as for integers). By convention, if there's a Python expression that will eval to another object that's ==, repr will return such an expression e.g.

>>> print repr('hi')
'hi'  # notice the quotes here as opposed to...
>>> print str('hi')
hi

If returning an expression doesn't make sense for an object, repr should return a string that's surrounded by < and > symbols e.g. <blah>.

To answer your original question:

%s <-> str %r <-> repr

In addition:

You can control the way an instance of your own classes convert to strings by implementing __str__ and __repr__ methods.

class Foo:

  def __init__(self, foo):
    self.foo = foo

  def __eq__(self, other):
    """Implements ==."""
    return self.foo == other.foo

  def __repr__(self):
    # if you eval the return value of this function,
    # you'll get another Foo instance that's == to self
    return "Foo(%r)" % self.foo

What, a punishment or reprimand (esp in the phrase give (a person) what for) See full dictionary entry for what. Quickly send and receive WhatsApp messages right from your computer.

It calls repr() on the object and inserts the resulting string.

What for definition and meaning, what as a pronoun, it can be the subject, object, or complement of a verb. It can also be the object of a preposition. noun the true nature or identity of something, or the sum of its characteristics: a lecture on the whats and hows of crop rotation.

It prints the replacement as a string with repr().

What, what also have various functions. It can be used as a adjective, an adverb, a pronoun, or an interjection. what definition: 1. used to ask for information about people or things: 2. used in questions that show you are…. Learn more.

Adding to the replies given above, '%r' can be useful in a scenario where you have a list with heterogeneous data type. Let's say, we have a list = [1, 'apple' , 2 , 'r','banana'] Obviously in this case using '%d' or '%s' would cause an error. Instead, we can use '%r' to print all these values.

What Part of Speech is “WHAT”, is in the sentence, "Take what clothes you need." whatever: adverb at all , of any description , of any kind or sort , whatsoever , whichever

The difference between %r and %s is, %r calls the repr() method and %s calls the str() method. Both of these are built-in Python functions.

The repr() method returns a printable representation of the given object. The str() method returns the "informal" or nicely printable representation of a given object.

In simple language, what the str() method does is print the result in a way which the end user would like to see:

name = "Adam"
str(name)
Out[1]: 'Adam'

The repr() method would print or show what an object actually looks like:

name = "Adam"
repr(name)
Out[1]: "'Adam'"

What dictionary definition, I will do what I can to help you. TranslationsEdit. show ▽what? (interrogative pronoun)  WhatsApp Messenger: More than 2 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere. WhatsApp is free and offers simple, secure, reliable messaging and calling, available on phones all over the world.

what, what definition: 1. used to ask for information about people or things: 2. used in questions that show you are…. Learn more. Of definition is - —used as a function word to indicate a point of reckoning. How to use of in a sentence.

WHAT, “What might the impact be of telling them that they can't cry at work?” But instead of taking a coaching approach, I responded instinctively and  See your real public IPv4 and IPv6 address. Make sure your VPN or Proxy are masking your IP address details. We provide IP address tools that allow users to perform an Internet Speed Test, IP address lookup, proxy detection, IP Whois Lookup, and more.

What to Say When Someone Cries at Work, Usage Note: When what is the subject of a clause, it takes a singular verb if the word or phrase that completes the sentence (the complement) is singular, as in I​  Seen a font in use and want to know what it is? Upload an image to WhatTheFont to find the closest matches in our database.

Comments
  • I've found %r to be useful for printing a string of unknown encoding, when otherwise an error can get thrown with %s
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