我需要把用户输入的字符串转换成莫尔斯电码。我们的教授希望我们这样做的方式是从一个morse code.txt文件中读取,将morseCode中的字母分成两个列表,然后将每个字母转换为morse代码(有空格时插入新行)。
我有开始。它所做的是读取morseCode.txt文件并将这些字母分成一个列表[a,B。。。Z] 把代码列成一个列表['–-。–––\n','。– . – . –\n'…]。
我们还没学会“套路”,所以我不能用它。那我怎么把他们输入的字符串,逐字逐句地读一遍,然后把它转换成莫尔斯电码呢?我有点忙。这是我现在所拥有的(一点也不多…)
编辑:完成程序!
# open morseCode.txt file to read
morseCodeFile = open('morseCode.txt', 'r') # format is <letter>:<morse code translation><\n>
# create an empty list for letters
letterList = []
# create an empty list for morse codes
codeList = []
# read the first line of the morseCode.txt
line = morseCodeFile.readline()
# while the line is not empty
while line != '':
# strip the \n from the end of each line
line = line.rstrip()
# append the first character of the line to the letterList
letterList.append(line[0])
# append the 3rd to last character of the line to the codeList
codeList.append(line[2:])
# read the next line
line = morseCodeFile.readline()
# close the file
morseCodeFile.close()
try:
# get user input
print("Enter a string to convert to morse code or press <enter> to quit")
userInput = input("")
# while the user inputs something, continue
while userInput:
# strip the spaces from their input
userInput = userInput.replace(' ', '')
# convert to uppercase
userInput = userInput.upper()
# set string accumulator
accumulateLetters = ''
# go through each letter of the word
for x in userInput:
# get the index of the letterList using x
index = letterList.index(x)
# get the morse code value from the codeList using the index found above
value = codeList[index]
# accumulate the letter found above
accumulateLetters += value
# print the letters
print(accumulateLetters)
# input to try again or <enter> to quit
print("Try again or press <enter> to quit")
userInput = input("")
except ValueError:
print("Error in input. Only alphanumeric characters, a comma, and period allowed")
main()
有几件事要告诉你:
这样加载会“更好”:
这样就不需要关闭,也不需要手动加载每一行等
为什么不遍历字符串呢?
回报
所以,在伪ish代码中,我会这样做:
注意:
morse_code_ify
函数是伪代码。您肯定想将要输出的字符列成一个列表,而不是仅仅将它们连接到某个字符串的末尾。如上所述,它是O(n^2):坏的。只需将它们附加到列表中,然后使用
"".join(the_list)
。顺便说一句:你为什么要搬走这些地方?为什么不让
morse_code_ify(" ")
返回一个"\n"
?使用“索引”。
当然,您需要验证您的输入字母(根据需要转换大小写,首先通过检查索引确保它在列表中!=—1),但这会让你走上正轨。
相关问题 更多 >
编程相关推荐