在 Python 3.4 中打印变量

Question

So the syntax seems to have changed from what I learned in Python 2... here is what I have so far

for key in word:
    i = 1
    if i < 6:
        print ( "%s. %s appears %s times.") % (str(i), key, str(wordBank[key]))

The first value being an int, the second a string, and the final an int.

How can I alter my print statement so that it prints the variables correctly?

Answer 1

The syntax has changed in thatprint is now a function . This means that the % formatting needs to be done inside the parenthesis: ¹

print("%d. %s appears %d times." % (i, key, wordBank[key]))

However, since you are using Python 3.x., you should actually be using the newer str.format method:

print("{}. {} appears {} times.".format(i, key, wordBank[key]))

Though % formatting is not officially deprecated (yet), it is discouraged in favor of str.format and will most likely be removed from the language in a coming version (Python 4 maybe?).

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_{¹ Just a minor note: %d is the format specifier for integers, not %s .}

Answer 2

版本 3.6+：使用格式化字符串文字，简称f-string

print(f"{i}. {key} appears {wordBank[key]} times.")

Answer 3

Try the format syntax:

print ("{0}. {1} appears {2} times.".format(1, 'b', 3.1415))

Outputs:

1. b appears 3.1415 times.

The print function is called just like any other function, with parenthesis around all its arguments.

Answer 4

You can also format the string like so:

>>> print ("{index}. {word} appears {count} times".format(index=1, word='Hello', count=42))

Which outputs

1. Hello appears 42 times.

Because the values are named, their order does not matter. Making the example below output the same as the above example.

>>> print ("{index}. {word} appears {count} times".format(count=42, index=1, word='Hello'))

Formatting string this way allows you to do this.

>>> data = {'count':42, 'index':1, 'word':'Hello'}
>>> print ("{index}. {word} appears {count} times.".format(**data))
1. Hello appears 42 times.

Answer 5

The problem seems to be a mis-placed ) . In your sample you have the % outside of the print() , you should move it inside:

Use this:

print("%s. %s appears %s times." % (str(i), key, str(wordBank[key])))

Answer 6

one can print values using the format method in python. This small example will help take input of two numbers a and b. Print a+b in first line and ab in second line

print('{:d}\n{:d}'.format(a+b,a-b))

Similarly in the answer we can do

print ("{0}. {1} appears {2} times.".format(22, 'c', 9999))

The python method format() for string is used to specify a string format. So {0},{1},{2} are like array indexes called as positional parameters. Therefore {0} is assigned first value written in format (a+b), {1} is assigned the second value (ab) and so on. We can also use keyword instead of positional parameter like for example

print("Hi! my name is {name}".format(name="rashi"))

Therefore name here is the keyword and its value is Rashi Hope it helps :)