如何從列表中刪除元素？

Question

嘗試從字符串中刪除不是數字的字符。 不幸的是，由於某種原因，我不能這樣做。 我也試過“del file[i][j]”，不幸的是沒有。

代碼：

file_open = open("napisy.txt","r")
wyniki = open("wyniki4.txt","w")
file = file_open.read().split()
file1 = file
print(file)
cyfry = ['0','1','2','3','4','5','6','7','8','9']
cyfry_zad3 = ''
licznik_cyfr = 0
tab = []
for i in range(0,len(file1)):
    for j in range(0,len(file1[i])):
        if file1[i][j] not in cyfry:
            file1.remove(file1[i][j])
            #del file1[i][j]
print(file1)

結果

Answer 1

讓一切變得更簡單怎么樣？

bad_characters = ['0','1','2','3','4','5','6','7','8','9'] 
file_text = file.read()
file_text = ''.join(filter(lambda c: c not in bad_characters, file_text))

適合新手的版本：

bad_characters = ['0','1','2','3','4','5','6','7','8','9'] 
file_text = file.read()
good_text = ""
for character in file_text:
    if character not in bad_characters:
        good_text += character 
print(good_text)

Answer 2

你可以用這個

file_open = open("napisy.txt","r")
file = file_open.read()
file_open.close()

for char in list(file):
    if char not in "1234567890":
        file = file.replace(char, "")