xy 在txt文件的一行中出现的频率是多少？ 在 Python 中

Question

I am provided with a txt file including lots of different letters. eg:

ab sbfdjd iojdig
ds fjk   sdfji oer
lkjäp   foküeeferf

How can I check how often for example the letter "j" was used in line 1, line 2 and line 3 and store this information in an array/list?

So for this certain example

print(NumberOfJInLine[0])

would output:

2

Answer 1

seekLetter = "j"
occur = {}

with open("{your filename}", "r") as file:
    for nbLine,line in enumerate(file):
        occur[nbLine] = line.count(seekLetter)

for line in occur.keys():
    print("line {0} : ".format(line) + str(occur[line]) + seekLetter)

you can do it more easily with a dictionary

Answer 2

Try this

def NumberOfStringInLine(index, string_to_find):
    print(string_to_find, lines_of_file[index])
    return lines_of_file[index].count(string_to_find)

def NumberOfJInLine(index):
    return NumberOfStringInLine(index, "j")


lines_of_file = open("text.txt", "r").readlines()
print(NumberOfStringInLine(0, "jd"))
print(NumberOfJInLine(0))

You don't need the other function I added but it adds flexibility.

Alternatively:

def AccumulateAppearances():
    with open("text.txt", "r") as file:
        for line in file:
            yield line.count("j")

for n in AccumulateAppearances():
    print(n)