目录
题目描述
输入/输出描述
解题思路
代码
代码走读
测试用例
1. 正常场景
2. 鲁棒性测试场景
传送门
题目描述
随机生成一个txt文件。要求文件的行数随机1 -- 100行。每一行随机1 -- 100个字符。字符随机从数字和大小写字母中选取。
输入一个字符，计算该字符在随机生成的txt文件中出现的次数。如果输入的是字母，不区分大小写，来计算其出现的次数。
条件限制：从txt文件中读取内容时，为了避免占用过多的内存，要求限制在100字节/次的读取速度。
输入/输出描述
输入：想要检测的字符（只能是数字或英文大小写字母）
输出：该字符在随机文件中和出现的次数。（不区分大小写）
解题思路
1、预置输出文件或清空文件
2、生成随机字符并写入文件
3、计算次数
代码
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53import string import random def rollback(url): open(url, "w").write("") return def read_file(url, ele, size=100): count = 0 with open(url, "r") as f: while True: line = f.read(size) if not line: break count += process(line, ele) f.close() return count def process(line, ele): lower = line.lower() return lower.count(ele.lower()) pools = string.digits + string.ascii_letters path = "example.txt" logo = input("Please input a char to count numbers in file: ") if len(logo) > 1: logo = logo[0] if logo not in pools: print("Invalid Char input.") exit() # 预置输出文件或清空文件 rollback(path) # 按要求生成随机内容并写入文件 lines_num = random.randint(1, 100) for i in range(lines_num): char_num = random.randint(1, 100) write_str = "" for j in range(char_num): rs = random.choice(pools) write_str += rs write_str += "n" open(path, "a").write(write_str) print("count char %s: %s" % (logo, read_file(path, logo)))
代码走读
复制代码
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62import string import random # 资源预置。创建或清空txt文件 def rollback(url): open(url, "w").write("") return # 读文件，读取速度限制在100字节/次，返回计算出字符出现的次数的结果 def read_file(url, ele, size=100): count = 0 with open(url, "r") as f: while True: line = f.read(size) if not line: break count += process(line, ele) f.close() return count # 真正计算次数的函数，将读取到的字符片段转化为小写（因为要求不区分大小写），在统一进行计算 def process(line, ele): lower = line.lower() return lower.count(ele.lower()) # 代码开始的位置。pools表示随机字符池，包含数字字符0-9和大小写字母。 pools = string.digits + string.ascii_letters # txt文件的路径 path = "example.txt" # 输入待检测次数的字符。如果输入多个字符，则只检测第一个输入的字符。如果第一个输入的字符不在pools中，则报错并终止程序 logo = input("Please input a char to count numbers in file: ") if len(logo) > 1: logo = logo[0] if logo not in pools: print("Invalid Char input.") exit() # 调用自定义的rollback()函数预置输出文件或清空文件 rollback(path) # 按要求生成随机内容并写入文件 # lines_num随机行数。char_num每一行的随机字符数 lines_num = random.randint(1, 100) for i in range(lines_num): char_num = random.randint(1, 100) write_str = "" for j in range(char_num): rs = random.choice(pools) write_str += rs write_str += "n" # 将随机字符拼接后的write_str写入txt文件中 open(path, "a").write(write_str) # 打印结果 print("count char %s: %s" % (logo, read_file(path, logo)))
测试用例
1. 正常场景
输入数字字符
运行结果：
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2Please input a char to count numbers in file: 6 count char 6: 58
随机生成的txt文件：
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输入大写字母
运行结果：
复制代码
1
2Please input a char to count numbers in file: K count char K: 172
随机生成的txt文件：
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输入小写字母
运行结果：
复制代码
1
2Please input a char to count numbers in file: y count char y: 72
随机生成的txt文件：
复制代码
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2. 鲁棒性测试场景
输入多个字符
运行结果：
复制代码
1
2Please input a char to count numbers in file: myapps count char m: 38
由此看出，程序面对多输入场景，只计算输入的首字符功能OK.
输入非pools内的字符（即不是数字0-9和英文大小写字母的字符）
运行结果：
复制代码
1
2Please input a char to count numbers in file: & Invalid Char input.
由此看出，程序面对非法字符的场景中能够识别并及时终止程序，避免无意义的资源浪费（生成文件并查找造成的时间和空间消耗）
传送门
1. input()函数
Python input函数_TCatTime的博客-CSDN博客
2. len()函数
Python len函数_TCatTime的博客-CSDN博客
3. print()函数
Python print函数：将内容打印到标准输出_TCatTime的博客-CSDN博客
4. exit()函数
Python exit函数_TCatTime的博客-CSDN博客
5. range()函数
Python range函数_TCatTime的博客-CSDN博客
最后
以上就是平淡水蜜桃最近收集整理的关于计算文本文件中特定字符的数量（Python）题目描述输入/输出描述解题思路代码代码走读 测试用例传送门的全部内容，更多相关计算文本文件中特定字符内容请搜索靠谱客的其他文章。
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