Don't understand why print(char + int) causes an error

Question

fname3 = input("Enter the Blue print name: ")
import re
with open (fname3) as file:
    fileText=file.read()
q1,q2,q3 = [ int(n) for n in re.findall(": (\d+)",fileText) ]
p1,p2,p3 = re.findall("(.*):",fileText)
qb=q1+q2
qc=q1+q2+q3

print("This BLUEPRINT CONTAINS--------------|")
print(p1+" Questions: "+q1)

This code above is giving an error of line: print(p1+" Questions: "+q1) but print(p1+" Questions: "+p1) is giving correct output abd also print("q1") but combining them is outputting an error

but gives error print("questions: "+q1) This code opens a txt file which contains the following:

Part A: 12 10*2 = 20
Part B: 6 4*5 = 20
Part C: 5 3*10 = 30

Answer 1

You need to convert to a string with str:

print(p1 + " Questions: " + str(q1))

Alternatively, simply use multiple arguments when calling print:

print(p1, "Questions:", q1)

Note that the spaces are added automatically with this method.

Answer 2

Another way to do this is with something called f-strings (available in Python 3.6+, but the latest version is 3.7):

print (f"{p1} Questions: {q1}")

Notice how there is an f before the quotes (applies to all types of quotes), and any variable you want has to be in {}

Answer 3

The problem is in the types of your variables.

Questions:, p1, p2 and p3 are all of type str.

Conversely, q1, q2 and q3 are of type int.

The print calls work separately because print can convert its arguments to str. However, you are first trying to add two strings (p1 and Questions:) to an int (q2), which is what fails.

Rather than naive addition/concatenation, you should prefer str.format calls:

print('{p} Questions: {q}'.format(p=p1, q=q1))

These make it easier to understand what the string will look like and automatically perform conversion of your arguments.

Answer 4

Python是强类型语言。在大多数情况下，它不执行任何隐式类型转换。考虑一下，“ 5” +7是12还是“ 57”？ 7+“ 5”怎么样？

在像这样的模棱两可的情况下，Python只会引发错误，而不是试图猜测您的意思。

您需要明确地进行类型转换：

print(p1+" Questions: "+str(q1))

或使用Python 3 f字符串：

print(f"{p1} Questions: {q1}")

或print函数接受多个参数，默认情况下将用空格分隔：

print(p1, "Questions:", q1)