python - 在 Python 中创建新的文本文件？

Question

有没有一种方法可以在不以“w”或“a”模式打开文本文件的情况下创建文本文件？例如，如果我想以“r”模式打开一个文件，但该文件不存在，那么当我捕获 IOError 时，我想创建一个新文件 例如:

while flag == True:
try:

    # opening src in a+ mode will allow me to read and append to file
    with open("Class {0} data.txt".format(classNo),"r") as src:

        # list containing all data from file, one line is one item in list
        data = src.readlines()

        for ind,line in enumerate(data):

            if surname.lower() and firstName.lower() in line.lower():
                # overwrite the relevant item in data with the updated score
                data[ind] = "{0} {1}\n".format(line.rstrip(),score)
                rewrite = True

            else:
                with open("Class {0} data.txt".format(classNo),"a") as src: 
                    src.write("{0},{1} : {2}{3} ".format(surname, firstName, score,"\n"))


    if rewrite == True:

        # reopen src in write mode and overwrite all the records with the items in data
        with open("Class {} data.txt".format(classNo),"w") as src: 
            src.writelines(data)
    flag = False

except IOError:
    print("New data file created")
    # Here I want a new file to be created and assigned to the variable src so when the
    # while loop iterates for the second time the file should successfully open

Answer 1

一开始只需检查文件是否存在，如果不存在则创建它:

filename = "Class {0} data.txt"
if not os.path.isfile(filename):
    open(filename, 'w').close()

从此时起，您可以假设该文件存在，这将大大简化您的代码。