python代码统计
❶ python函数统计字符串中字母数学其他字符的个数
代码如下：
text = "Hello Python,Hello 2021."
letter = 0
digital = 0
other = 0
for i in text:
if i.isalpha():
letter += 1
elif i.isdigit():
digital += 1
else:
other += 1
print('字母:{} 数字:{} 其他:{}'.format(letter,digital,other))
输出：
字母:16 数字:4 其他:4
下面是Python内置关于判断字符串类型的方法介绍：
str.isalnum()
如果字符串中的所有字符都是字母或数字且至少有一个字符，则返回True， 否则返回False。 如果c.isalpha()，c.isdecimal()，c.isdigit()，或c.isnumeric()之中有一个返回True，则字符``c``是字母或数字。
str.isalpha()
如果字符串中的所有字符都是字母，并且至少有一个字符，返回True，否则返回False。字母字符是指那些在 Unicode 字符数据库中定义为 "Letter" 的字符，即那些具有 "Lm"、"Lt"、"Lu"、"Ll" 或 "Lo" 之一的通用类别属性的字符。 注意，这与 Unicode 标准中定义的"字母"属性不同。
str.isascii()
如果字符串为空或字符串中的所有字符都是 ASCII ，返回True，否则返回False。ASCII 字符的码点范围是 U+0000-U+007F 。
3.7 新版功能.
str.isdecimal()
如果字符串中的所有字符都是十进制字符且该字符串至少有一个字符，则返回True， 否则返回False。十进制字符指那些可以用来组成10进制数字的字符，例如 U+0660 ，即阿拉伯字母数字0 。 严格地讲，十进制字符是 Unicode 通用类别 "Nd" 中的一个字符。
str.isdigit()
如果字符串中的所有字符都是数字，并且至少有一个字符，返回True，否则返回False。 数字包括十进制字符和需要特殊处理的数字，如兼容性上标数字。这包括了不能用来组成 10 进制数的数字，如 Kharosthi 数。 严格地讲，数字是指属性值为 Numeric_Type=Digit 或 Numeric_Type=Decimal 的字符。
str.isidentifier()
如果字符串是有效的标识符，返回True，依据语言定义，标识符和关键字节。
调用keyword.iskeyword()来检测字符串s是否为保留标识符，例如def和class。
❷ 如何用python统计单词的频率
代码：
passage="""Editor’s Note: Looking through VOA's listener mail, we came across a letter that asked a simple question. "What do Americans think about China?" We all care about the perceptions of others. It helps us better understand who we are. VOA Reporter Michael Lipin begins a series providing some answers to our listener's question. His assignment: present a clearer picture of what Americans think about their chief world rival, and what drives those perceptions.
Two common American attitudes toward China can be identified from the latest U.S. public opinion surveys published by Gallup and Pew Research Center in the past year.
First, most of the Americans surveyed have unfavorable opinions of China as a whole, but do not view the country as a threat toward the United States at the present time.
Second, most survey respondents expect China to pose an economic and military threat to the United States in the future, with more Americans worried about the perceived economic threat than the military one.
Most Americans view China unfavorably
To understand why most Americans appear to have negative feelings about China, analysts interviewed by VOA say a variety of factors should be considered. Primary among them is a lack of familiarity.
"Most Americans do not have a strong interest in foreign affairs, Chinese or otherwise," says Robert Daly, director of the Kissinger Institute on China and the United States at the Washington-based Wilson Center.
Many of those Americans also have never traveled to China, in part because of the distance and expense. "That means that like most human beings, they take short cuts to understanding China," Daly says.
Rather than make the effort to regularly consume a wide range of U.S. media reports about China, analysts say many Americans base their views on widely-publicized major events in China's recent history."""
passage=passage.replace(","," ").replace("."," ").replace(":"," ").replace("’","'").
replace('"'," ").replace("?"," ").replace("!"," ").replace(" "," ")#把标点改成空格
passagelist=passage.split(" ")#拆分成一个个单词
pc=passagelist.()#复制一份
for i in range(len(pc)):
pi=pc[i]#这一个字符串
if pi.count(" ")==len(pi):#如果全是空格
passagelist.remove(pi)#删除此项
worddict={}
for j in range(len(passagelist)):
pj=passagelist[j]#这一个单词
if pj not in worddict:#如果未被统计到
worddict[pj]=1#增加单词统计，次数设为1
else:#如果统计过了
worddict[pj]+=1#次数增加1
output=""#按照字母表顺序，制表符
worddictlist=list(worddict.keys())#提取所有的单词
worddictlist.sort()#排序（但大小写会出现问题）
worddict2={}
for k in worddictlist:
worddict2[k]=worddict[k]#排序好的字典
print("单次 次数")
for m in worddict2:#遍历输出
tabs=(23-len(m))//8#根据单次长度输入，如果复制到表格，请把此行改为tabs=2
print("%s%s%d"%(m," "*tabs,worddict[m]))
注：加粗部分是您要统计的短文，请修改。我这里的输出效果是：
American 1
Americans 9
Center 2
China 10
China's 1
Chinese 1
Daly 2
Editor's 1
First 1
Gallup 1
His 1
Institute 1
It 1
Kissinger 1
Lipin 1
Looking 1
Many 1
Michael 1
Most 2
Note 1
Pew 1
Primary 1
Rather 1
Reporter 1
Research 1
Robert 1
S 2
Second 1
States 3
That 1
To 1
Two 1
U 2
United 3
VOA 2
VOA's 1
Washington-based1
We 1
What 1
Wilson 1
a 10
about 6
across 1
affairs 1
all 1
also 1
among 1
an 1
analysts 2
and 5
answers 1
appear 1
are 1
as 2
asked 1
assignment 1
at 2
attitudes 1
base 1
be 2
because 1
begins 1
beings 1
better 1
but 1
by 2
came 1
can 1
care 1
chief 1
clearer 1
common 1
considered 1
consume 1
country 1
cuts 1
director 1
distance 1
do 3
drives 1
economic 2
effort 1
events 1
expect 1
expense 1
factors 1
familiarity 1
feelings 1
foreign 1
from 1
future 1
have 4
helps 1
history 1
human 1
identified 1
in 5
interest 1
interviewed 1
is 1
lack 1
latest 1
letter 1
like 1
listener 1
listener's 1
mail 1
major 1
make 1
many 1
means 1
media 1
military 2
more 1
most 4
negative 1
never 1
not 2
of 10
on 2
one 1
opinion 1
opinions 1
or 1
others 1
otherwise 1
our 1
part 1
past 1
perceived 1
perceptions 2
picture 1
pose 1
present 2
providing 1
public 1
published 1
question 2
range 1
recent 1
regularly 1
reports 1
respondents 1
rival 1
say 2
says 2
series 1
short 1
should 1
simple 1
some 1
strong 1
survey 1
surveyed 1
surveys 1
take 1
than 2
that 2
the 16
their 2
them 1
they 1
think 2
those 2
threat 3
through 1
time 1
to 7
toward 2
traveled 1
understand 2
understanding 1
unfavorable 1
unfavorably 1
us 1
variety 1
view 2
views 1
we 2
what 2
who 1
whole 1
why 1
wide 1
widely-publicized1
with 1
world 1
worried 1
year 1
（应该是对齐的，到这就乱了）
注：目前难以解决的漏洞
1、大小写问题，无法分辨哪些必须大写哪些只是首字母大写
2、's问题，目前如果含有只能算为一个单词里的
3、排序问题，很难做到按照出现次数排序
❸ Python接收输入一个字符串，统计其中小写字母的个数
可以这样编写程序:
1、定义一个含有所有小写字母的列表变量w及一个待测字符串变量s。
2、对s字符串中的每一个字符进行循环迭代检测其是否位于变量w中，若为真，则对计数变量c进行加一操作。
3、输出c变量，即为所求。
具体代码及运行示例如下图所示:
程序代码及示例运行结果
❹ python统计单词中字母个数
代码：
string = "T-shirt"
letters = []
for i in range(65, 91):
letters.append(chr(i))#A-Z
for i in range(97, 123):
letters.append(chr(i))#a-z
num = 0
for i in string:
if i in letters:#如果是字母
num += 1
print(num)#输出num
运行效果：
6
备注：加粗部分的单词可以自己改。
解析：
通过ASCII码和chr函数查找到所有大小写字母，再逐一遍历单词，如果是字母就+1个，这样就可以得到统计数据了。
❺ Python 统计列表里面有多少个元素
Python 统计列表里面有多少个元素步骤如下：
1、打开python语言命令窗口，定义一个列表变量Z并打印对应的列表值。
❻ python统计excel数据分析
咨询记录 · 回答于2021-12-08
❼ Python如何统计一行数据同时满足A和B的次数
可以用pandas
也可以直接用csv库读入然后for循环计算