如何使用 python 测试 txt 文件中的特定行

Question

I create txt file that contain three lines

hi123
ok
good

and I want to test if the my var is equal to some line in the txt file the first line in my txt file is equal to my var when i print it but the test is give me False like this

file = open("copy.txt", "r")
all_lines_variable = file.readlines()
var = 'hi123'
print(all_lines_variable[0], all_lines_variable[0] == var)
file.close()

and the output is

hi123
 False

Answer 1

Because the specific line in your file is not 'hi123' , in fact, it's 'hi123\n' . There is a newline at the end. So you can change your var to 'hi123\n' or try to remove any newline character.

Answer 2

Because there is a line break at the end of the line. You can see that by the fact that print wrote the contents of var in a new line.

If the var contents just have to be in that line, you could use print(all_lines_variable[0], var in all_lines_variable[0]) instead.

Otherwise, you could remove the last character of the line (the break) and use it in the comparison like this: print(all_lines_variable[0], all_lines_variable[0][:-1] == var)