Question

我一直在解决这个问题，但除了最后一部分之外，我已经解决了很多问题。我需要为列表迭代一些循环，以便它填满整个表。我正在做的是尝试结合文本文件

for example pulsars1=
1
2
3
4
5

and signals1=
M
I
N
N
A

所以我希望列表看起来像

1M, 2I, 3N etc..

我几乎得到了它，只是它只执行此列表的前两个条目.. 它看起来像这样：

This program proccess data from the Purdue Pulsar Laboratory
============================================================
It reads the data from 2 files containing the pulsar name and signal strength, 
then combines them and displays the results.

Pulsar name file: pulsars1.txt
Signal strength: signals1.txt

Analyzing data from pulsars1.txt and signals1.txt files...
      Reading from pulsars1.txt ...
      Reading from signals1.txt ...
      Combining values...

The combined BOOYA data includes 3 values.
1M

所以你可以看到它正在梳理第一行，但其余部分却没有这样做。这是我现在的代码。

# defining the read function
def read(pulsar_name,signal_strength):
    #opening and reading data from first line
    pulsars = open(pulsar_name,"r").readlines()
    #opening and reading data from second line
    signals = open(signal_strength,"r").readlines()
    #creating a new empty list
    astro_list = []
    #appending pulsar values to list
    for all_pulse in range(0,len(signals)):
        astro_list.append(pulsars)
    #appending signal data to list
        for all_signal in range(0,len(signals)):
            astro_list.append(signals)
            for i in range(0,len(astro_list)):
                return(pulsars[i].rstrip()+signals[i])

#defining the main function
def main():

    #displaying a description of what the program does
    purpose = "This program proccess data from the Purdue Pulsar Laboratory"
    underheading = "=" * len(purpose)
    print(purpose)
    print(underheading)
    print("It reads the data from 2 files containing the pulsar name and signal strength, \nthen combines them and displays the results.")
    #accepting inputs from the user about file names
    pulsar_name = input("\nPulsar name file: ")
    signal_strength = input("Signal strength: ")
    #calling
    astro_list = read(pulsar_name,signal_strength)
    read(pulsar_name,signal_strength)
    #reading values
    print("\nAnalyzing data from" , pulsar_name, "and", signal_strength, "files...")
    print("     ","Reading from" ,pulsar_name,"...")
    print("     ","Reading from" ,signal_strength,"...")
    print("     ","Combining values...")
    #displaying the top part of the table/ counting the number of elements that are in the list
    print("\nThe combined BOOYA data includes" ,len(astro_list), "values.")
    print(read(pulsar_name,signal_strength))


if __name__ == '__main__':
    main()

任何建议？谢谢

Answer 1

在这里使用zip可能是一个好主意。如果您确定，您的两个文本文件始终包含相同数量的条目，zip会这样做，但为了更灵活，您可以使用itertools.zip_longest：

from itertools import zip_longest

def main():
    #input of pulsar_name and signal_strength as described by you, e.g. you end up with
    #pulsar_name = "test1.txt"
    #signal_strength = "test2.txt"
    #read file and remove whitespaces and newline escape code
    pulsar_list = [line.strip(" \n") for line in open(pulsar_name, "r")]
    signal_list = [line.strip(" \n") for line in open(signal_strength, "r")]
    #combine the two list and mark those entries without a counterpart
    astro_list = list(zip_longest(pulsar_list, signal_list, fillvalue = "-missing-"))
    #print out the list
    for i, item in enumerate(astro_list):
        print("Entry #", i, "for astrolist is ", item, "and consists of pulsar data", 
              pulsar_list[i], "and signal strength", signal_list[i])


main()

输出循环只是向您展示如何访问所有三个列表中的数据的示例。如果pulsar和signal不具有相同的长度，则输出无法正常工作。我可以用不同的方式编写它来考虑长度不等的列表，但由于这只是一个例子，我不想让它变得比必要的复杂。

Iterarting列出问题

1 个答案: