论坛 › Python交流 › 得出矩阵中不为0的元素的坐标

wadmdmaw 发表于 2022-4-17 11:05:14

得出矩阵中不为0的元素的坐标

问题在最下面
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要求定位这个矩阵中不为0的元素的坐标，以列表形式如[行，列，数值]
我写的：
s=open("abc.csv","r").read()
s.replace(" ","")
ls=s[:-1].split("\n")
ls1=[]
for i in ls:
    ls1.append(i.split(","))
for i in range(len(ls1)):
    for j in range(len(ls1)):
      ls1=int(ls1)
ls2=[]
for i in range(len(ls1)):
    for j in range(len(ls1)):
      if ls1!=0:
            ls2.append(])
print(ls2)
但总会这样报错：
line 9, in <module>
    ls1=int(ls1)
ValueError: invalid literal for int() with base 10: ''

上网搜了一下这样报错是文本里有空格的原因么？但我第二排已经把空格全部replace了呀？为什么运行还是这样报错呢？

isdkz 发表于 2022-4-17 11:32:19

本帖最后由 isdkz 于 2022-4-17 11:59 编辑

你报错的原因在于这句：ls=s[:-1].split("\n")，[:-1]是不包含最后一个字符的，

所以你的最后一个字符就成了 “," ，以 “,” 分割后就会有一个 空字符，空字符是不能用 int() 转整数的

s=open("abc.csv","r").read()
s.replace(" ","")
ls=s.splitlines()                     # s[:-1].split("\n") 改成 s.splitlines()
ls1=[]
for i in ls:
    ls1.append(i.split(","))
for i in range(len(ls1)):
    for j in range(len(ls1)):      # len(ls1) 改成 len(ls1)
      ls1=int(ls1)
ls2=[]
for i in range(len(ls1)):
    for j in range(len(ls1)):
      if ls1!=0:
            ls2.append(])
print(ls2)

傻眼貓咪 发表于 2022-4-17 11:42:57

试试这个import csv

with open("xxxxxxxxx.csv", 'r') as file:
    text = csv.reader(file, skipinitialspace = True)
    for r, row in enumerate(text):
      temp =
      for c, num in enumerate(temp):
            if num:
                print(f"({r}, {c})")

wadmdmaw 发表于 2022-4-17 12:25:37

isdkz 发表于 2022-4-17 11:32
你报错的原因在于这句：ls=s[:-1].split("\n")，[:-1]是不包含最后一个字符的，

所以你的最后一个字符就 ...

你好，可以麻烦再展开讲讲”s=s[:-1].split("\n")，[:-1]是不包含最后一个字符的“这里么，我这样写不是按换行符把矩阵的一行作为一个元素放进ls矩阵的么，一共有矩阵行数那么多的元素，放进去的应该都是数值和”，”符号啊？哪里有空字符呢？而且矩阵里就算有空字符s.replace(" ","")我这里不是已经都replace了么？
大佬你的这种ls=s.splitlines() 写法是什么作用呢？

isdkz 发表于 2022-4-17 12:33:07

wadmdmaw 发表于 2022-4-17 12:25
你好，可以麻烦再展开讲讲”s=s[:-1].split("\n")，[:-1]是不包含最后一个字符的“这里么，我这样写不是 ...

你的最后一个字符不是换行符就不能不包含最后一个，

你可以用 s=s.split("\n")，splitlines() 跟 split("\n") 的区别是 splitlines 会忽略后面的换行

wadmdmaw 发表于 2022-4-17 13:36:17

isdkz 发表于 2022-4-17 12:33
你的最后一个字符不是换行符就不能不包含最后一个，

你可以用 s=s.split("\n")，splitlines() 跟 spli ...

是因为这个矩阵的最后一行结束没有换行符号，所以用s.split的话矩阵最后一行是不会包含进去么，splitlines就无所谓最后有无换行符？那空格的产生是怎么回事呢？

isdkz 发表于 2022-4-17 13:42:30

wadmdmaw 发表于 2022-4-17 13:36
是因为这个矩阵的最后一行结束没有换行符号，所以用s.split的话矩阵最后一行是不会包含进去么，splitline ...

不是空格，是空白字符

>>> a = '0,0,0,0'                  # 没有换行
>>> a[:-1]                           # 将最后一个字符排除在外后，最后一个字符变成了逗号
'0,0,0,'
>>> a[:-1].split(',')                  # 因为最后一个字符是逗号，逗号后面没有任何字符，所以分割出一个空白字符
['0', '0', '0', '']
>>> a = '0,0,0,0\n'               # 最后一个字符是换行的话
>>> a
'0,0,0,0\n'
>>> a[:-1]                            # 排除最后一个字符正常
'0,0,0,0'
>>> a[:-1].split(',')
['0', '0', '0', '0']
>>> a.splitlines()                   # splitlines 在以换行分割的时候可以忽略最后的换行
['0,0,0,0']
>>>

wadmdmaw 发表于 2022-4-17 13:55:42

isdkz 发表于 2022-4-17 13:42
不是空格，是空白字符

>>> a = '0,0,0,0'                  # 没有换行


好详细！懂了 感谢大佬！！！！！

wadmdmaw 发表于 2022-4-17 13:58:22

傻眼貓咪 发表于 2022-4-17 11:42
试试这个

谢谢！但还是想在自己原有基础上改一下...

查看完整版本: 得出矩阵中不为0的元素的坐标