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[英]Exception handling in python Counting the number of characters in a string
[英]Counting total number of unique characters for Python string
對於我上面的問題,我非常卡住。 到目前為止,我想出的代碼是:
def count_bases():
get_user_input()
amountA=get_user_input.count('A')
if amountA == 0:
print("wrong")
else:
print ("right",amountA)
def get_user_input():
one = input("Please enter DNA bases: ")
two=list(one)
print(two)
我的思路是我首先:
1. 要求用戶輸入 DNA 鹼基 (ATCG)
2.將用戶輸入改為列表
3.回到主(count_bases)function,我數了'A','T','C','G'的個數
4. 對四個不同的基數使用 4 個 if-else 語句。
到目前為止,我的代碼只適用於用戶輸入到列表中的 output。 之后,就會彈出一個錯誤。
如果有人可以為我指出正確的道路,將不勝感激!
謝謝。
您可以使用collections.Counter
from collections import Counter
def get_user_input():
input_str = input("Please enter DNA bases: ")
c = dict(Counter('ACCAGGA'))
return c
def count_bases():
counts = get_user_input()
dna_base = list("ATCG")
for base in dna_base:
if base not in counts.keys():
print(f"{base} not found")
else:
print(f"{base} count: {counts[base]}")
output當我調用count_bases()
Please enter DNA bases: >? ACCAGGCA
A count: 3
T not found
C count: 2
G count: 2
如果您制作一個臨時集,根據定義,它只包含唯一的項目/字符怎么辦? 即在unique_chars=set(input_string)
的行中?
並計算一切使用 zip 與理解? 例如: nr_of_instances=zip(unique_chars, [input_string.count(x) for x in unique_chars])
這樣做可能有更簡單更優雅的方法,但是要使用一些內置函數......我不是每天都使用 zip,但在這里它可能會派上用場?
一些可能引發錯誤的錯誤如下:
get_user_input()
返回 DNA 字符串列表count_bases()
中有一個文本get_user_input
,它既不是 function 調用也不是變量名稱。以下代碼供您參考,它糾正了提到的錯誤:
def count_bases():
inp = get_user_input()
amountA = inp.count('A')
if amountA == 0:
print("wrong")
else:
print ("right",amountA)
def get_user_input():
one = input("Please enter DNA bases: ")
two = list(one)
print(two)
return two
上面的代碼將只提供一個基數,即“A”。 為了利用所有基地的數量,這可能會有所幫助:
def count_bases():
inp = list(input("Please enter DNA bases: "))
for base in 'ATCG':
count_base = inp.count(base)
if count_base == 0:
print("Not found.")
else:
print ("Count of ", base," is: ", count_base)
get_user_input().count('A')
input()
function 收集。這應該有效:
def count_bases():
char_list = get_user_input()
for char in 'ATCG':
char_count = char_list.count(char)
if char_count < 1:
print(char + " not found")
else:
print(char + " count: " + str(char_count))
def get_user_input():
one = input("Please enter DNA bases: ")
two=list(one)
return two
def count_bases(val: str, character: str) -> int:
# return the count of character in val
if character in val:
return val.count(character)
else:
return 0
def get_user_input() -> None:
# get the input from the user
value = input('Please enter DNA bases: ')
# find the unique characters in the input
characters = ['A', 'T', 'C', 'G']
# find the count
for char in characters:
count = count_bases(value, char)
if count == 0:
# do something
else:
# do something else
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