I have some code like:
score = 100
name = 'Alice'
print('Total score for %s is %s', name, score)
I want it to print out Total score for Alice is 100, but instead I get Total score for %s is %s Alice 100. How can I get everything to print in the right order with the right formatting?
See also: How can I print multiple things on the same line, one at a time? ; How do I put a variable’s value inside a string (interpolate it into the string)?
1
There are many ways to do this. To fix your current code using %-formatting, you need to pass in a tuple:
-
Pass it as a tuple:
print("Total score for %s is %s" % (name, score))
A tuple with a single element looks like ('this',).
Here are some other common ways of doing it:
-
Pass it as a dictionary:
print("Total score for %(n)s is %(s)s" % {'n': name, 's': score})
There’s also new-style string formatting, which might be a little easier to read:
-
Use new-style string formatting:
print("Total score for {} is {}".format(name, score)) -
Use new-style string formatting with numbers (useful for reordering or printing the same one multiple times):
print("Total score for {0} is {1}".format(name, score)) -
Use new-style string formatting with explicit names:
print("Total score for {n} is {s}".format(n=name, s=score)) -
Concatenate strings:
print("Total score for " + str(name) + " is " + str(score))
The clearest two, in my opinion:
-
Just pass the values as parameters:
print("Total score for", name, "is", score)If you don’t want spaces to be inserted automatically by
printin the above example, change thesepparameter:print("Total score for ", name, " is ", score, sep='')If you’re using Python 2, won’t be able to use the last two because
printisn’t a function in Python 2. You can, however, import this behavior from__future__:from __future__ import print_function -
Use the new
f-string formatting in Python 3.6:print(f'Total score for {name} is {score}')
7
There are many ways to print that.
Let’s have a look with another example.
a = 10
b = 20
c = a + b
#Normal string concatenation
print("sum of", a , "and" , b , "is" , c)
#convert variable into str
print("sum of " + str(a) + " and " + str(b) + " is " + str(c))
# if you want to print in tuple way
print("Sum of %s and %s is %s: " %(a,b,c))
#New style string formatting
print("sum of {} and {} is {}".format(a,b,c))
#in case you want to use repr()
print("sum of " + repr(a) + " and " + repr(b) + " is " + repr(c))
EDIT :
#New f-string formatting from Python 3.6:
print(f'Sum of {a} and {b} is {c}')
2
Use: .format():
print("Total score for {0} is {1}".format(name, score))
Or:
// Recommended, more readable code
print("Total score for {n} is {s}".format(n=name, s=score))
Or:
print("Total score for" + name + " is " + score)
Or:
print("Total score for %s is %d" % (name, score))
Or: f-string formatting from Python 3.6:
print(f'Total score for {name} is {score}')
Can use repr and automatically the '' is added:
print("Total score for" + repr(name) + " is " + repr(score))
# or for advanced:
print(f'Total score for {name!r} is {score!r}')
In Python 3.6, f-string is much cleaner.
In earlier version:
print("Total score for %s is %s. " % (name, score))
In Python 3.6:
print(f'Total score for {name} is {score}.')
will do.
It is more efficient and elegant.
Keeping it simple, I personally like string concatenation:
print("Total score for " + name + " is " + score)
It works with both Python 2.7 an 3.X.
NOTE: If score is an int, then, you should convert it to str:
print("Total score for " + name + " is " + str(score))
Just follow this
grade = "the biggest idiot"
year = 22
print("I have been {} for {} years.".format(grade, year))
OR
grade = "the biggest idiot"
year = 22
print("I have been %s for %s years." % (grade, year))
And forget all others, else the brain won’t be able to map all the formats.
1
Just try:
print("Total score for", name, "is", score)
Use f-string:
print(f'Total score for {name} is {score}')
Or
Use .format:
print("Total score for {} is {}".format(name, score))
2
print("Total score for %s is %s " % (name, score))
%s can be replace by %d or %f
If score is a number, then
print("Total score for %s is %d" % (name, score))
If score is a string, then
print("Total score for %s is %s" % (name, score))
If score is a number, then it’s %d, if it’s a string, then it’s %s, if score is a float, then it’s %f
The easiest way is as follows
print(f"Total score for {name} is {score}")
Just put an “f” in front.
This is what I do:
print("Total score for " + name + " is " + score)
Remember to put a space after for and before and after is.
This was probably a casting issue. Casting syntax happens when you try to combine two different types of variables. Since we cannot convert a string to an integer or float always, we have to convert our integers into a string. This is how you do it.: str(x). To convert to a integer, it’s: int(x), and a float is float(x). Our code will be:
print('Total score for ' + str(name) + ' is ' + str(score))
Also! Run this snippet to see a table of how to convert different types of variables!
<table style="border-collapse: collapse; width: 100%;background-color:maroon; color: #00b2b2;">
<tbody>
<tr>
<td style="width: 50%;font-family: serif; padding: 3px;">Booleans</td>
<td style="width: 50%;font-family: serif; padding: 3px;"><code>bool()</code></td>
</tr>
<tr>
<td style="width: 50%;font-family: serif;padding: 3px">Dictionaries</td>
<td style="width: 50%;font-family: serif;padding: 3px"><code>dict()</code></td>
</tr>
<tr>
<td style="width: 50%;font-family: serif;padding: 3px">Floats</td>
<td style="width: 50%;font-family: serif;padding: 3px"><code>float()</code></td>
</tr>
<tr>
<td style="width: 50%;font-family: serif;padding:3px">Integers</td>
<td style="width: 50%;font-family: serif;padding:3px;"><code>int()</code></td>
</tr>
<tr>
<td style="width: 50%;font-family: serif;padding: 3px">Lists</td>
<td style="width: 50%font-family: serif;padding: 3px;"><code>list()</code></td>
</tr>
</tbody>
</table>
print(f"Total score calculation complete, {name=}, {score=}")
# this will print:
# Total score calculation complete, name='Alice', score=100
Note that this prints name='Alice', not just 'Alice'!
All features:
- You get variable name printing along with variable value. This is extremely useful for debug printing. If you don’t need it for a certain variable, omit the
=sign. - If you rename, remove or add any debugged variables, this print line will remain correct
- Don’t worry about alignment. If you have multiple variables, is the 4-th argument
scoreorage? Well, you don’t care, it’s correct regardless. - Note that this is only available for Python 3.8+