[英]Forming a chemical formula from a string of elements python
I want to ask a question about converting a list of items into a string.我想问一个关于将项目列表转换为字符串的问题。
I have the following list of a SiH2O molecule, where the 2 implies the subscript of 2 hydrogen atoms:我有以下 SiH2O 分子列表,其中 2 表示 2 个氢原子的下标:
[['Si', array([0, 1, 2])],
['H', array([3, 4, 5])],
['O', array([6, 7, 8])],
['H', array([3, 4, 5])]]
My intention is to convert this data into a chemical formulae ie SiH2O.我的目的是将这些数据转换为化学公式,即 SiH2O。
Another example is shown below:另一个例子如下所示:
['H', array([3, 4, 5])],
['F', array([6, 7, 8])],
['H', array([3, 4, 5])]]
I am attempting to convert this to H2F
(without any subscript formatting - I purely want to reach the H2F
output.)我正在尝试将其转换为
H2F
(没有任何下标格式 - 我纯粹想达到H2F
output。)
My attempt so far is as follows:到目前为止,我的尝试如下:
I first looped through the string to retrieve all the chemical symbols:我首先遍历字符串以检索所有化学符号:
symbols = []
for item in string:
symbols.append(item[0])
symbols
I then tried to find the unique atoms in the string (ie a string of elements that are only repeated once in the string):然后我试图在字符串中找到唯一的原子(即在字符串中只重复一次的一串元素):
unique = []
for i in symbols:
if i not in unique:
unique.append(i)
And this returned这又回来了
['Si', 'H', 'O']
and和
['H', 'F']
respectively.分别。
I attempted to create a dictionary of the elements and their count, with an original default of 0:我试图创建一个元素及其计数的字典,原始默认值为 0:
myDict = {key:0 for key in unique}
and then attempted to count through the dictionary.然后试图通过字典数数。
for item in symbols:
count = myDict[item]
count += 1
myDict[item] = count
This returns:这将返回:
{'Si': 1, 'H': 2, 'O': 1}
Now, I want to use the key, value
pair to compile the string SiH2O
.现在,我想使用
key, value
对来编译字符串SiH2O
。 I used the condition if value == 1
then I would not attach the subscript number after the chemical symbol.我使用了
if value == 1
的条件,那么我不会在化学符号后附加下标数字。
This was the code I attempted.这是我尝试的代码。
chemical_string = ""
for key, value in symbols:
if value == 0:
chemical_string += key
else:
chemical_string += key + "" + value
I expected the result SiH2O
but I fall into this error:我期待结果
SiH2O
但我陷入了这个错误:
ValueError Traceback (most recent call last)
<ipython-input-57-d5312c683c2e> in <module>
1 chemical_string = ""
----> 2 for key, value in myDict:
3 if value == 0:
4 chemical_string += key
5 else:
ValueError: not enough values to unpack (expected 2, got 1)
I'm confused on why this doesn't work.我很困惑为什么这不起作用。 How can I solve this matter?
我该如何解决这个问题?
As per @Luka Mensaric's answer, I need to use the .items()
method.根据@Luka Mensaric 的回答,我需要使用
.items()
方法。
I also realised I need to convert value
into a str
inside the else
statement:我还意识到我需要在
else
语句中将value
转换为str
:
chemical_string = ""
for key, value in myDict.items():
if value == 1:
chemical_string += key
else:
chemical_string += key + "" + str(value)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.