Write output of a while loop to multiple text files

Question

I have two issues: the while loop is finishing at 1.1 not 1 and how can I save a text file for each value of alpha_min as the way I wrote the code, only the last message of alpha_min is being saved in the text file?

alpha_min = 0
alpha_max = 1

while (alpha_min < alpha_max):
    alpha_min += 0.1
    #Length of message 
    length_msg = (alpha_min * n)
    len_msg = int(length_msg)
    print(alpha_min)

    #Generates random messages, 1D vectora consisting of 1s and 0s for different values of alpha
    msg = np.random.randint(2, size= len_msg)
    print(msg)

    #Save messages in text format representing each bit as 0 or 1 on a separate line
    msg_text_file = open("msg_file.txt", "w")  # Path of Data File
    msg_text_file.write("\n".join(map(lambda x: str(x), msg)))
    msg_text_file.close()

To fix your first problem, change the < on line 4 to <=

Qwerty
– Qwerty

2017-05-15 19:11:12 +00:00
Commented May 15, 2017 at 19:11 — Qwerty
– Qwerty, Commented May 15, 2017 at 19:11
@Qwerty didn't get you sorry

Charles B
– Charles B

2017-05-15 19:12:07 +00:00
Commented May 15, 2017 at 19:12 — Charles B
– Charles B, Commented May 15, 2017 at 19:12
why not? what dont you get

Qwerty
– Qwerty

2017-05-15 19:14:25 +00:00
Commented May 15, 2017 at 19:14 — Qwerty
– Qwerty, Commented May 15, 2017 at 19:14
@Qwerty I tried it still didnt work, im using python 2.7

Charles B
– Charles B

2017-05-15 19:25:04 +00:00
Commented May 15, 2017 at 19:25 — Charles B
– Charles B, Commented May 15, 2017 at 19:25

Thomas Kowalski · Accepted Answer · 2017-05-15 19:34:40Z

1

You should only open the file once and close it at the end, because what you're doing right now is overwriting the file at each iteration (or you could use append rather than write)

alpha_min = 0
alpha_max = 1



while (alpha_min < alpha_max):
    alpha_min += 0.1
    #Length of message 
    length_msg = (alpha_min * n)
    len_msg = int(length_msg)
    print(alpha_min)

    #Generates random messages, 1D vectora consisting of 1s and 0s for different values of alpha
    msg = np.random.randint(2, size= len_msg)
    print(msg)

    #Save messages in text format representing each bit as 0 or 1 on a separate line
    msg_text_file = open("msg_file_{}.txt".format(alpha_min), "w")  # Path of Data File
    msg_text_file.write("\n".join(map(lambda x: str(x), msg)))
    msg_text_file.close()

edited May 15, 2017 at 19:34

answered May 15, 2017 at 19:15

Thomas Kowalski

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6 Comments

Charles B Over a year ago

still generated a single text file for some odd reason

Thomas Kowalski Over a year ago

What it's doing is generating a single file and putting all the contents in it. If you want one file per iteration, you have to have a different name for it (and move back the open and the close to your loop). For example, f = open("message_{}.txt".format(alpha_min), 'w') and then do what you want.

Charles B Over a year ago

do i do this before the while loop or inside the loop?

Charles B Over a year ago

thank you so much man! Is it possible to save multiple images resulting from a for loop? as only the last image is being saved simialrly to the =text file scenario

Thomas Kowalski Over a year ago

I don't really understand the question... what do you mean by "multiple images" ?

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