CODEWITHSUNDEEP
pythonpython-3.x
meskerem
meskerem

Reputation: 399

Is it possible to declare a variable with a value for string and a placeholder in python?

I am trying to initialize a long string value to a variable, but this string has a word that can not be constant, like this example.

Say I want to store a string like this. 

str = "https://stackoverflow.com/users/7833397/meskerem"

But assume the number 7833397 will change over time, so I am trying to find a way to store the string while making making a wildcard for the number. But I am not sure if this can be done in Python

Upvotes: 9

Views: 12859

Answers (3)

Jan Christoph Terasa
Jan Christoph Terasa

Reputation: 5945

First, avoid usign the identifier str. Second, you can put placeholders in strings using two methods of string formatting:

Old style

The "old" style uses C-style string formatting syntax, and "modulo" operation on the string to do the actual insertion. You can pass multiple replacements as a tuple:

s = "foo%sbaz" # expects a string
print(s%"bar")
s2 = "foo%s%d"
print(s2%("bar", 2))

New style

The "new" style uses a generic {} which can be filled using the str.format() method. Multiple replacements are passed as a unzipped tuple, i.e. as mutiple arguments:

s = "foo{}baz" # can be "anything"
print(s.format("bar"))
s2 = "foo{}{}"
print(s2.format("bar", 2))

This site might come handy as a reference.

Upvotes: 7

Himanshu dua
Himanshu dua

Reputation: 2513

You can use '%s'(string formatting syntax )

modified_str = "https://stackoverflow.com/users/%s/meskerem" % (number,)

Upvotes: 0

ymbirtt
ymbirtt

Reputation: 1686

Use the format method.

template = "https://stackoverflow.com/users/{0}/meskerem"

# Lots of stuff happens here

url = template.format("7833397")

The format method supports its own little mini language, and depending on your use-case you may find it more intuitive to name the various parts of your template, too:

template = "https://stackoverflow.com/users/{id}/{username}"

# Lots of stuff happens here

url = template.format(id="7833397", username="meskerem")

Upvotes: 25

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