如何在python中合并两个字符串？

Question

我需要合并字符串以创建一个字符串。例如，需要合并的“hello”字符串为： [H ----]，[-E ---]，[--LL-]和[---- O]

这是我必须使字母出现在第一位的当前代码。

display_string = "[" + "".join([x if x == letter else "-" for x in word]) + "]" 

我怎么会去制作琴弦如 [H ----]，[HE ---]，[HELL-]，最后[HELLO]？

Answer 1

我不知道这是否有助于你想要的方式，但这是有效的。问题是我们没有真正的字符串替换。在最后的组装之前，字符列表可能对你更好。

string_list = [ 
    'H----', 
    '-E---', 
    '--LL-', 
    '----O' 
] 

word_len = len(string_list[0]) 
display_string = word_len*'-' 
for word in string_list: 
    for i in range(word_len): 
     if word[i].isalpha(): 
      display_string = display_string[:i] + word[i] + display_string[i+1:] 
    print '[' + display_string + ']' 

Answer 2

好吧，所以我想我明白你要去哪里了。

我们定义了一个词“hello”，然后我们遍历“hello”中的所有唯一字母，我们得到您的display_string s。那么你的问题是如何将它们合并回来？

word = "HELLO" 
all_display_strings = ["[" + "".join([x if x == letter else "-" for x in word]) + "]" for letter in word] 
# now merge the list of lists 
length = len(all_display_strings[0])-2 # -2 for the opening and closing bracket 
merged_display_strings = ['-']*length 

for i in range(0, length): 
     for j in range(0, len(all_display_strings)): 
      if (all_display_strings[j][i+1] != '-'): 
       merged_display_strings[i] = all_display_strings[j][i+1] 


print(''.join(merged_display_strings)) 

Answer 3

假设你的字符串列表中的all_strings

all_strings = ["[H----]", "[-E---]", "[--LL-]", "[----O]"] 
# clean them 
all_strings = map(lambda x:x.strip()[1:-1], all_strings) 

# Let's create a list for the characters in the final string(for easy mutating) 
final_string = ['' for _ in xrange(max(map(len, all_strings)))] 

for single in all_strings: 
    for i, char in enumerate(single): 
     if char != '-': final_string[i]=char 

print "[" + ''.join(final_string) + "]" 

Answer 4

strings = 'h----', '-e---', '--ll-', '----o' 
letterSoups = [ [ (p, c) for (p, c) in enumerate(s) if c != '-' ] 
    for s in strings ] 
result = list('-----') 
for soup in letterSoups: 
    for p, c in soup: 
    result[p] = c 
print ''.join(result) 

Answer 5

s = "[H----], [-E---], [--LL-], [----O]" 

print(''.join(re.findall(r'\w', s))) 

HELLO