Python使用字符串格式运算符打印两个列表

Question

How do I write python scrip to solve this?

l=[1,2,3] Length A
X=[one,two,three,.... ] length A

how do print/write to file output should be

1=one 2=two 3=three .... 

Trying to use something like but since the Length A is variable this won't work

logfile.write('%d=%s %d=%s %d=%s %d=%s \n' % (l[1], X[1],l[2,X[3],l[4],X[4]))

Answer 1

Use zip :

l = [1, 2, 3]
X = ['one', 'two', 'three']
' '.join('{}={}'.format(first, second) for first, second in zip(l, X))

Output:

'1=one 2=two 3=three'

Answer 2

You could also use an fString to make this more concise:

numbers = [1, 2, 3]
strings = ['one', 'two', 'three']
print(' '.join(f'{n}={s}' for n,s in zip(numbers,strings)))

Answer 3

• zip(a, b) would return pairs from both lists until shorter list is over
• map(f, a) would apply function f to every element in list a.
• join is a python way to concatenate strings

All combined:

print(''.join(map('{}={}'.format, zip(l, X))))
print(''.join(map('='.join, zip(map(str,l), X))))

since join works on strings only, map(str,l) convert [1, 2,..] to ['1', '2', ..]

format works on any input, so extra conversion is not required