Python 100 Programming Examples and Solutions

This document provides a catalog of 100 Python programming exercises, each with a problem statement, brief analysis, and a full code implementation. The examples range from basic arithmetic and control structures to more complex algorithms and data manipulations.

Example 001: Number Combination

Problem: Given the digits 1, 2, 3, 4, generate all distinct three‑digit numbers without repeating digits.

Analysis: Iterate through all possible triples and filter out those with duplicate digits.

<code>total=0
for i in range(1,5):
    for j in range(1,5):
        for k in range(1,5):
            if ((i!=j)and(j!=k)and(k!=i)):
                print(i,j,k)
                total+=1
print(total)</code>

A more concise solution uses itertools.permutations :

<code>import itertools
sum2=0
a=[1,2,3,4]
for i in itertools.permutations(a,3):
    print(i)
    sum2+=1
print(sum2)</code>

Example 002: Tax Bonus Calculation

Problem: Compute a bonus based on profit tiers with decreasing commission rates.

Analysis: Apply piecewise calculations for each profit interval.

<code>profit=int(input('Show me the money: '))
bonus=0
thresholds=[100000,100000,200000,200000,400000]
rates=[0.1,0.075,0.05,0.03,0.015,0.01]
for i in range(len(thresholds)):
    if profit<=thresholds[i]:
        bonus+=profit*rates[i]
        profit=0
        break
    else:
        bonus+=thresholds[i]*rates[i]
        profit-=thresholds[i]
bonus+=profit*rates[-1]
print(bonus)</code>

Example 003: Perfect Square Problem

Problem: Find an integer that becomes a perfect square after adding 100 and again after adding 168.

Analysis: Brute‑force search up to the point where the gap between successive squares exceeds 168.

<code>n=0
while (n+1)**2-n*n<=168:
    n+=1
print(n+1)</code>

Example 004: Day of Year

Problem: Determine the day number within a year for a given date, accounting for leap years.

<code>def isLeapYear(y):
    return (y%400==0 or (y%4==0 and y%100!=0))
DofM=[0,31,28,31,30,31,30,31,31,30,31,30]
res=0
year=int(input('Year:'))
month=int(input('Month:'))
day=int(input('day:'))
if isLeapYear(year):
    DofM[2]+=1
for i in range(month):
    res+=DofM[i]
print(res+day)</code>

Example 005: Sorting Three Numbers

Problem: Input three integers and output them in ascending order.

<code>raw=[]
for i in range(3):
    x=int(input('int%d: '%(i)))
    raw.append(x)
for i in range(len(raw)):
    for j in range(i,len(raw)):
        if raw[i]>raw[j]:
            raw[i],raw[j]=raw[j],raw[i]
print(raw)
# Using built‑in sort
raw2=[]
for i in range(3):
    x=int(input('int%d: '%(i)))
    raw2.append(x)
print(sorted(raw2))</code>

Example 006: Fibonacci Sequence

Problem: Generate Fibonacci numbers using recursion or iteration.

<code>def Fib(n):
    return 1 if n<=2 else Fib(n-1)+Fib(n-2)
print(Fib(int(input())))
# Iterative version
target=int(input())
res=0
a,b=1,1
for i in range(target-1):
    a,b=b,a+b
print(a)</code>

... (similar sections continue for examples 007 through 050, each presenting the problem, brief analysis, and the corresponding Python code wrapped in tags) ...

The collection concludes with references to the original repository.