python - What's wrong with the IF some words IN a string -


this question has answer here:

how check string specific characters? find link useful. what's wrong codes?

string = "a17_b_c_s.txt"  if ("m.txt" , "17") in string:     print true else:     print false

and answer comes out

true

this because and evaluates 17 in stringlist. and evaluates 17 because of short circuiting.

>>> "m.txt" , "17" '17'

python evaluates non empty strings value true. hence, m.txt evaluates true, value of expression depends on second value returned(17) , found in stringlist. (why? when and performed true value, value of expression depends on second value, if it's false, value of expression false, else, it's true.)

you need change expression 

if "m.txt" in stringlist , "17" in stringlist:     #...

or use builtin all() 

if all(elem in stringlist elem in ["m.txt", "17"]):     #...

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