使用课程从.txt文件创建字典

Question

Write a program to create a dictionary that has the key-value pairs from the file "CourseInstructor.txt" I started to create a dictionary using the txt, file but receive the following error:

Course=("CourseInstructor.txt",'r')
for line in Course:
    key,val = line.split(" ")
    Inst[key] = val
Course.close()

ValueError: not enough values to unpack (expected 2, got 1)

Answer 1

You should do something like this:

Inst = dict()
with open("CourseInstructor.txt",'r') as Course:
    for line in Course:
        key,val = line.rstrip("\n").split(" ")
        Inst[key] = val

the best way to open files is with , it will close file after. the rstrip("\\n") will remove \\n from end of each line. one more thing that you should know is your input file( CourseInstructor.txt ) should be like this:

key1 value1
key2 value2
key3 value3

If your file dose not contain new lines, use this:

your_string = your_string.split(" ")
keys = [i for i in your_string[::2]]
values = [i for i in your_string[1::2]]
final_dict = {keys[i]:values[i] for i in range(len(values)) }

Answer 2

If your file looks like this:

key1 value1
key2 value2
key3 value3

you can try:

print({line.split()[0]:line.split()[1] for line in open('file','r')})

Output:

{'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}

File will eventually be closed when the file object is garbage collected. check this for more info.